Depending on how much air flow you have to the front bedroom, go in through the basement and check the duct to that register and make sure is on and not kinked. I used registers that you can close to help solve mine. Another buddy of mine has his duct almost kinked completely off, but in these units, it is where they put the furnace. More of the newer ones have the furnace in a different location.
2012 Sandpiper 365SAQ weighing @ 15k, Onan, 2nd air, slide toppers, TST
2013 F350 6.7L Lariat 4x4 CC DRW,Viair 1007, Ride-Rites, Edge CTS, B&W
2001 Chevy 3500CC DRW 4x4, 8.1L, 4.10 gears w/ Detroit TrueTrac
2001 Ford Excursion Limited 4x4 7.3L,V/B Spring Mod, ProComps, Hellwig Swaybar, & other 'Necessities'