Just bought a used 08 Sundace 3300SK. Having a couple of problems. One is with the fridge, its a Dometic refrigerator Model RM2852 - the top half (freezer) is working fine, but the bottom fridge part is not cooling. Any ideas on what to check? Also turned on the AC -its a Dometic Duotherm. Unit came on and sounded like compressor came on, but after running unit for about 2 hours, no cool air was coming out. Filter is clean. Any comments or suggestions would be appreciated. Thank you.