Furnace Problem

[Jimmer]

Been having some problems on my furnace on a 2014 3582 RL. The performance seems to have decreased. We are in Arizona and we are going through a cold spell. Does not seem like there is much air coming out of the registers. It takes forever for the trailer to warm up and the furnace to shut off. We also have noticed the furnace will get real noisy after running for awhile. Any ideas? I am going to take off the basement walls to see if a hose came off.
Jim Bonhote.