I have a 1993 Newmar Kountry Aire, 25th anniversary edition. It came from the factory with a rear fan for the heating ducts under the floor. The fan is no longer working, can not find how to access. Newmar said it was under the bed, ripped out carpet and insulation, no access panel. Any help would be great, as without this fan, and only the fan on the gas heater, it heats the RV but uses 2 to 3 times as much LPG. Thanks diagrams, info would be most appreciated.