Just got my 23J home from winter storage yesterday, looked at my kitchen sink and the drain pipe drains towards the bathroom, oposite of yours. My pic looks alot different under the sink?
I also included a photo of a water filter and expansion tank I installed last fall, fit very nicely in the space next to the water pump. Also check your water fill hose clamps at the fill and the tank, mine were loose and leaked when the tank was full.
2015 Starcraft Travel Star 299BHU Black Pearl Edition
2011 Jayco X23J (traded in)
2009 Ford F150 FX4 SuperCrew