You may have to gain additional access through the bottom where there is a plastic tray that has the holes in it that allows the waste water pipes to leave the bottom of the trailer. it is held in place with screws and a sticky glue like substance. I pulled mine down to fix a sticky valve and then re attached the plastic tray. Was easier for me to work on it from the bottom than the top.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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