Drain leak under chassis

[BigBlue72]

New member here, so go easy on me. I have searched the forums for answers and found plenty on leaks, but none specific to my issue. We took the Axis on a 5 day trip recently and noticed it was leaking grey water from under the chassis. Appears to be limited to the two sinks. It also appears that this drain pipe is hidden under a black underbelly panel. Winterized with pink antifreeze and all supply lines seem to be intact. Must have had some water in the drain pipes to dilute it at that low spot. Question is, does anyone know the best way to remove the black panel underneath to access the drain lines from the sinks to the grey tank? I assume I will find a busted pipe or loose fitting.

Thanks in advance.

[BigBlue72]

Bump. Still no solution found.

[JamieGeek]

Did you contact Thor to get the waste diagrams? (While your at it ask for all the available diagrams on the coach.)

Then at least you'll know where the pipes should be going, where the joints are, and, more importantly, where to look for leaks.

[BigBlue72]

Waiting on those from them now. That should show me what to expect to see, but I don't see any access to those lines without getting that skid plate looking panel off or going under the floor ???

[JamieGeek]

Originally Posted by BigBlue72

Waiting on those from them now. That should show me what to expect to see, but I don't see any access to those lines without getting that skid plate looking panel off or going under the floor ???

How long have you been waiting? Did you call or e-mail? (If you call you usually get the pdf files within the same day.)

How do you know its grey water? Could it be fresh? Are your low point drain valves completely closed?

[BigBlue72]

I emailed. I'll call tomorrow. It only leaks when someone uses either the kitchen sink or the hallway sink. I assume they merge into a drain line that leads to the grey tank. The point of the leak is almost direct under the middle of the coach between the stove/fridge area and the grey tank. No water inside, only beneath when those sinks are used and not when shower is used. You can actually see soapy water underneath if someone washes their hands or dishes. I just don't see a way to access that portion of the lines. I've not worried about it too much since it is just a little grey water on the ground, but want to get it repaired before I need to winterize again later this year.