Going over the different forums and subjects here, some themes are a normal occurance no matter the make and model of trailer or fw. Kitchen sinks being one of the many, our Gateway had a leak that was intermittant and impossible to locate because of that fact, it took 2 1/2 years before we got it taken care of, i know this is somewhat off subject here but i believe it is pertinant.
The problem ended up being the faucet, Ron at Heartland sent me a new unit to install myself because our dealership was not able to fix the problem and actually falsified warrenty claims to Heartlnd concerning repairs made to the fw from water damages caused by the faucet leaking, luckily it was documented while we were still under warrenty and Ron worked with me for over 1 1/2 years after our warrenty was up to help find and repair the leak, he also was working with me to get the repairs done that our dealerhip did not do, long story.......after we fixed the leak, i tried to give our dealer a chance to do the right thing, left the fw with them for 2 plus months before we needed to use our rig, they didn't touch it so we left and never looked back to them, when i tried to find another dealer last year, i had no luck locateing another dealerrship, and this spring to do the water damage repairs i was told by another rep from Heartland i was to far our of warrenty and on my own, Ron has since transfered from the west to the east coast and sent me an email stateing because of the transfer he was unable to be of help anymore, the reason i got in touch with another rep.....
I am selling our Gateway now because of this problem and looking at another brand now other than Heartland, i have bragged and written a blog basically about our fiver, how much we loved it, got a lot of help from other owners on the forum for issues that popped up from time to time and appreciate all the help i did get when needed. Thank you all.
Good luck with your sink troubles, my advise would be to document everything, let your dealer try to do the repairs and if they can not, find one who can while you are still under warrenty.