We had a water leak at our bathroom sink. Took the RV in for warranty work and they returned it with a leak. I just happened to look in one of the storage compartments and saw water dripping from above. Traced it back the the bathroom sink. They replaced the counter top in the bathroom. Didn’t put the washer back in the connection. By the way, you cannot replace the washer. Had to buy the fitting. Never worked with PEX pipes so I had no tools. After about $100 of tool purchases, I have it fixed. They would have fixed it but, I would have to tow it back to Camping World and wait a day to get it fixed then tow it back to our RV site. Hotel for one night with a dog is $130. Good thing I caught it early, it could have caused a lot of problems. Always check things after any service!
Good advice. And a good thing you are a handyman at heart!