There may be a plugged cold water filter under the kitchen sink. In our 2015 23D International Serenity we see a small cylinder in line with the water line about 1.5" in diameter and about seven or eight inches long. In the 2014 Classic there is a more elaborate system with a twist off filter like in a home under the kitchen sink.
Also there could be a filter screen at the end of the faucet that is plugged with stuff.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels