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Thank you for your kind help and pictures. It's apparent Redwood engineering gave no consideration to repair access when they cobbled the holding tan...

@bsomms Where in Texas can I take my Redwood and have this issue put to bed? I can not find a way to get to the valve in question. I've dropped th...

I'd sure be interested in what they find. I haven't backed up but no flow when I dumped the 2nd grey tank.

@webberwj That is a good question. I considered that thinking the 2 tanks might be plumbed together. It's not backing up to suggest it's full. ...

@webberwj That is what mine looks like. 2 grey, 1 black. The right grey is the one that won't open. I pretty sure it's for the shower and bathr...

I have a single outlet pipe for combined sewer. The valve is apparently on top of the tank. I cannot see a way to access it. I would appreciate any...

@rog-paul I took the coroplast loose and found the black water valve and the functioning grey water valve but the non functioning valve is some...