I was winterizing our 2015 179 and may have over pressurized the fresh water system. Now when I apply 30 lbs. air pressure to the blow out plug and immediately place a tire gauge on on the plug it doesn't register any pressure...zip, nada, nothing. This makes me think I screwed up when I inadvertently used 50 plus lbs. and may have split a connection or pipe.
What is the best way to try to find my leak? Are there plumbing schematics anywhere, is there a safety valve anywhere? Am I missing something...double checked and the hot and cold sink and shower facets are closed.
Any guidance or suggestions would be greatly appreciated.