Trans warning light 95 Monaco M11 / 4060 Crown Royale

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I'm looking at 95 Monaco M11 / 4060 Crown Royal with aqua hot,24" rims,in motion sat. , one piece fiberglass roof , newer ACs ,side radiator, 4 wheel disc brk.. Went through coach for a day. Owner pointed everything he knew wrong.The only things I found alone was a missing rear bilstien shock just rubber bushing on top bolt and damaged ref. vent.
When it started the trans warning light was on. He said it drove fine, so took for a 40 mile ride him out me back. It has 120k he used it for 11 years stored inside pole barn , used not so much last 2yrs. He said he still ran and drove it as not to let it just sit. Batteries were dirty but still functioned , so I believe it more.He built & raced a drag car and towed it on trailer with MH. Took a lot of care for RV has box of bunch of spare belts, filters, headlight. He has CDL and Tows campers form Indiana out west, has lift in garage. Does not seem like run into ground type guy.
He replaced the genny with a boxed 12k unit and said the person that helped wire up interior controls ,didn't plug the cruise control wires on switches "in left arm rest switch cluster area "and he was too big to get in there.
From my understanding it's a very good motor / trans combo, but doo doo happens. Not a drip from motor or trans.

BACK to TRANS
No other lights came on, temps stayed under 165 shifting felt seamless. Only really even felt last down shifts coming up one hill to stop.
I have downloaded code manual / operator & troubleshooting.
I will pull codes and post them.
I guess we should clear codes and see if they come back on another run.
I have been doing a lot of reading most problems are wiring issues could it be cruise control wires.