If its the old white/cream perforated padded ceiling used by Winnebago for one the glue is starting to release from foam backing. If you have an older coach you can expect more bubbles to start showing up and spreading. Hopefully you have a newer RV and won't face this problem.
Bill & Kathy Francis
95 Itasca Sunrise 29RQ,P32 454 Chevy, Banks,ECM chip.Safe-T-Plus, Bilsteins, Super Steer Bell Crank, Stewart Stage 1 Waterpump, Severe Duty Fan Clutch, OilGuard Bypass Filter, Coolant Filter. Rear Tracbar. 1-5/8" Front Swaybar.