Turns out it was the valve actuator cable after all. I dropped the coroplast (not fun) and found the tank configuration was nothing like I expected. The galley gray tank was oriented across the trailer just in front of the axles, the black tank and bathroom gray tank are oriented front to back in front of the galley gray tank. The black tank and bathroom gray tank both dumped into a 3 inch main drain and the galley gray tank was on it's own 1 1/2" main drain. Good thing I dropped the coroplast and did not rely on the assumption that the gray tanks were on the same main drain line. Could have been a very messy mistake.
Anyway, cable is fixed, other cables are lubed and working smoothly and life is good again.
It's a shame Keystone doesn't put out diagrams of what goes on under the coroplast. Someone should start publishing manuals for RVs like a Chilton's Guide or similar. I know these trailers aren't complicated, but some engineer must do a layout drawing during the mfgr. process don't ya think?
Oh, I also found the flex duct for the heated underbelly was completely detached from the underfloor ductwork.....no screws were installed, just foil duct taped.
Thanks
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Oflag
2012 Laredo 310 RE
2011 F250 SC 6.7 Powerstroke
Quality of life is 10% what happens to you.....90% how you react
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