Texas winter storm freeze

[capbli]

We were hoping we would not have freeze and pipe burst problems from the recent very cold weather, but, alas, we've got a leak on the bathroom floor.
Our 1981 Excella has been re-plumbed with PEX, but either a fitting or PEX pipe has burst. The problem is, I can't see it. The leak is either in the incoming fresh water line or the hot/cold lines leading to the water heater. All of these lines disappear into a block of spray-in foam insulation at the left rear of the trailer...a bit out of easy reach. My thought is to simply replace one line at a time starting with the inlet line and bypassing what is there now. Hopefully the water inlet can be dropped easily so a new pipe can be attached.
I'm open to other ideas from older more experienced AS folks.

[Lily&Me]

I had this problem one year, dewinterizing revealed something had burst behind the toilet.

I couldn’t see it, either, did go into an RV place somewhere south and they replaced it for me....after first telling me they would sell me the part and instruct me how to do it myself.

Ha!

It is an apparently common issue and location.

If you can’t see it, maybe put a small mirror or your phone back there to get a visual.

Good luck,

Maggie