When you do find it, just delete it and your worries are over. We had a similar incident as arkhillbilly in the first RV. That one was in a wall behind the TV. We've ditched them ever since. On most, where the pex goes up to the valve, then back down again, we just rid of those pieces and make a straight shot.
John and Rebecca Dickson
Emma-8 / Little John-5 / Iva-1+
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)