Ok, you asked for it.
Completed items since purchase in '07:
I replaced the water pump (original) with a Whisper King since it was much quieter, didn't pulse and was a cheaper ($) alternative to a higher flow electronic unit.
Replaced the stove/oven thermocouple and valve since the thermocouple was broken off of the valve and no one could tell me how to fix it. I ended up finding an exact valve (used) at an RV surplus place for $10. It works great.(BTW, the "dealers" I contacted with the correct part number and the valve for visual verification managed to get me the wrong valve 5 times...)
I replaced all three original air bag leveling valves because they didn't level and were constantly leaking.
I replaced the driveshaft u-joints (Spicer = $130/ea. versus Neapco = $34/ea. ...both USA made, both same quality) since when I was under the rig greasing all zerks, I noticed that the u-joints and slip splined shaft took over 1-1/4 tubes of grease...

and when I started to grease the slip spline and u-joints, clouds of dirt flew out...
I replaced some cabinet hinges and struts because they were breaking.
I had to foam/caulk all manner of floor penetrations to keep critters out.
I had to repair my water rally kit since it didn't work and was leaking.
I replaced both Valterra guillotine waste valves since they were cracked and leaking.
I have had to replace all of the operable locks/brackets etc. on my Carefree awning due to breakage/cracks.
I have greased every zerk fitting I could find.
I have replaced the original serpentine belt and ac fan belt since they were about to snap.
I had to re-wire the generator remote start and pre-heat switches from the generator to the dash since the logic board has a bad circuit and I can only imagine how expensive that part is.
I have had to re-rivet/foam/silicone some compartment frames since they are breaking/separating.
I had to replace the windshields and gasket due to cracks.
I had to replace the Pos-A-Lock door closer assembly since it was broken/missing.
Re-calibrate the VDO speedometer so it reads accurately.
Added a fan vent cover.
Pending Items:
Replace the chassis shocks since they are leaking.
Replace all batteries.
Clean and inspect the CAC and radiator cores properly which means cutting and modifying the shroud for access.
Service the Generac Diesel generator since I do not believe it has ever been done, as well as replace the flexible sections of fuel line due to deterioration and clean/straighten the generator radiator core fins.
Replace the passenger side entry door window gaskets due to shrinkage.
Replace the entry door gasket due to tearing.
Replace all compartment door gaskets due to tearing. BTW, these bulb-type gaskets are $5/foot.
Adjust all compartment door latches since they are moving causing the putty tape/dum-dum to smear on the coach.
Re-build some of the cabinet drawer boxes.
Replace all cabinet drawer slides with Accuride ball bearing full-extension slides
Service the transmission.
Service/replace the air filter.
Adjust the valves.
Check/adjust the service brakes and air dryer (if I can find it).
Primer and coat the rubber roof.
Replace the AC shrouds due to cracking.
Re-build the rally and water system "beauty" panels and supports.
Add missing/new compartment carpeted panels to "seal-off" the frame and wiring chases.
Build full extension pull-out compartment slides.
Polish/wax the darn thing.
I would like to change out/upgrade the rear vision camera and the interior seats/couches but that is waaaaay down on the list.
I need to make new dash bezels and may give them a cool surface treatment...but we will see.
As you can see I have done a lot with more still to come but I want to be able to use this thing for quite a while. A lot of the items were due to age or neglect. Others are to repair shoddy workmanship from GS. Overall I would rate GS's workmanship fair at best. I still have some drooping overhead cabinet issues to resolve and their idea of wiring/cabling is a joke.