What was found
AFTER TAKEOFF, A LOUD RUMBLING NOISE AND VIBRATION OCCURRED. PASSENGERS FELT VIBRATION IN MIDDLE OF AIRCRAFT AND REPORTED WATER DRIPPING FROM AIR CONDITIONING OUTLETS. ACCOMPLISHED TSM 05-50-00-810-801 AND 53-35-00-810. EMERGENCY DECLARED.AIRCRAFT WAS GROUNDED. RETURNED TO DEPARTURE UNEVENTFUL LANDING. INSPECTED WING TO BODY FAIRING SEALS, LEFT/RIGHT PACK BAYS, RECIRCULATION FANS, FLAPS/FAIRINGS LEFT/RIGHT WING, BOTH WHEEL WELLS, ALL COMPONENTS CHECKED OK. OPERATIONAL CHECKED GOOD.