I have a 2019 Palomino Solaire 316 RLTS travel trailer. I having issues getting water to my island faucet. There is a little but it just drips. I have tried switching the valves at the water heater but none seem to be to the problem. I have found 4 valves but i am wondering if i am missing any that i can not see. There are no valves under the sink. Any ideas?