What was found
NOTABLE ELECTRICAL SMELL EMHATING FROM ROW 29 TO THE AFT OF THE PLANE. OCCURRED TWICE IN LEVEL FLIGHT BY BOTH PASSENGER + ALL FLIGHT ATTENDANT-AFTER TALKING TO THE CREW SMELL DISIPATED ON ITS OWN. FOLLOWED TSM 05-50-00-810-831-A (TYPE 9) NO ODOR/SMELL DETECTD AFTER CIDS INTERFACE/POWER UP TEST IAW AMM23-73-00-740-005-B+ DRAIN MAST 30-71-00-710-001. COULD NOT DUPLICATE ON GROUND. NO FAULT DETETED. NO SMELL. A/C OK FOR CONT. SERVICE.