What was found
ACRID SMELL IN ACFT. AFTER ENGINE SHUTDOWN, VISIBLE SMOKE IN CABIN. ACCOMPLISH SMOKE OR FUMES IN CABIN FIM TASK DMC-B787-A-21-20-F5-72A-421A-A AND ACCOMPLISH IDLE ENG RUN AND SHUTDOWN TO VERIFY NO SMOKE OR ODORS OCCUR AT ENG SHUT DOWN. INBOUND CAPT REPORTED FWD CABIN DOORS CLOSED SMOKE & ODOR VIEWED & SMELLED IN FWD CABIN. ODOR OF SMOKE DISSAPATED QUICKLY. THE CREW COULD NOT PINPOINT WHERE IT WAS FROM. RECOMMENDS AMM DMC-B787-A-05-51-99-99A-282A-A, ACCOMPLISHED & IAW FIM 21-20-F5-72A-421A, NO SPILL OR UNWANTED MATERIAL NOTICED AT FRONTAL ZONE, NO RELATED MAINTENACE MSG, FLIGHT DECK EQUIPMENT, PASSENGER CABIN EQUIPMENT, RECIRCULATION FAN, HEPA FILTER, HEAT EXCHANGER, CARGO BAY EQUIPMENT, NO DISCREPANCIES FOUND DURING INSP, WHEN CHECKING AIR CONDITIONING PACK, FOUND L1 MOTOR COOLING ELECT CONNECTOR DETACHED. REINSTALLED IAW AMM 21-51-19. ACCOMPLISHED 5 MINS OPS TEST . ENG RUN,. NO SMOKING COMING FROM ENG PIPES AFTER ENG SHUT DOWN. CABIN ODOR WITHOUT ODOR. ACFT GOOD TO SVC.