What was found
THE ODOR OF HOT PLASTIC OR HOT VINYL WAS NOTICED BY 4 CREW MEMBERS. THE ODOR IS MUCH STRONGER TOWARDS THE CEILING OF THE CABIN. THE STRONGEST ODOR COMING FROM THE CEILING BETWEEN SEATS 3 & 5. NO SMOKE IS NOTICED. DUCT SUPPLY TEMP IS 46 DEGREES TO THE CABIN & 60 DEGREES TO THE COCKPIT. REMOVED BOTH PSU'S & FOUND 9 LAMPS TO HAVE GLUE LIKE SUBSTANCE ON THEM & ALL OTHER LAMPS TO BE DIRTY. R & R 9 LAMPS & CLEANED THE REMAINING BULBS. INSTALLED PSU'S & RAN APU, THERE WAS NO SMELL IAW CE-750 MM 30-00-00.