Before you go spending alot of money, go to Walmart or Camping World ect, and buy the bag of Lemon tablets (I think, there may be various types) gray water deodorizers. They are about $8 for a bag of 10. You just put one in your kitchen sink and run a little water which dissolves the tabs. If the smell is really bad use a couple. This may clear up your problem right away. If it works, put another one in after you dump the holding tank.
Seeing as you have had the propane systems checked professionally, and the batteries are not the source, I think you're gray water holding tank is the culprit, and it is coming up through the kitchen sink. We had this happen, and even though we dumped the holding tank the smell didn't go away. We did the deodorizing tabs and it went away immediately and hasn't come back. After getting control of the odor, I use the tabs after about every 3 or 4 dumps and have not had the smell come back. It's worth a try before you go spending alot more money.
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Mike & Charlotte
2014 Newmar Canyon Star 3610
Orange County, California
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