I've got this faucet; I believe it is mdl #: LG49-YP1K. Same prob as case #'s: 201711317687 or 201602380138, the water flow is fine with the hot water valve, but barely a trickle from the cold water. My plumber told me I should contact you for a new stem, but after reading this other reviews, I'm not so sure. What should I do? Mark