Thanks to all who have responded. Was able to empty tanks and flush. Have since ordered the Valterra 3" valves. Will be here tomorrow. After taking off the entire under belly, the only thing I have noticed so far, is the cables are extremely long and flop around as you closed them. They are not secured in any matter.
After removing belly pan, had several feet of extra hydraulic hose and electrical wire fall out all over the place. Some of the runs were over 6 feet too long. Nothing was secured. Zipped tied it all up and made sure nothing was rubbing on the metal components.
I have been very lucking with my unit. Have had it for two years now and no problems so far. Have extended warranty that would take care of this, but would rather do it myself.
Thanks once again to all who responded.
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2015 GMC DRW 3500
2014 3625RE
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