What was found
FLT 485 BOS-LAX, CREW DECLARED AN EMERGENCY AND AIRCRAFT DIVERTED TO MSP. DURING CRUISE THE FLT ATTENDANT NOTIFIED COCKPIT OF AN ODOR IN THE MIDDLE SECTION OF THE CABIN. A PAX IN ROW 3 SAID HE HEARD CRACKING SOUND IN HIS HEADSET AND IST 3 ROWS OF TV'S WENT BLACK JUST BEFORE THE ODOR STARTED. DURING DIVERSION THE ODOR WENT AWAY BUT CAME BACK BEFORE LANDING. ACCOMPLISHED TSM 24-00-00-810-823A NO FAULTS FOUND. PERFORMED NR 1 AND 2 ENG RUN WITH BLEEDS ON PACK RUNNING, NO FAULTS NOTED. ALSO PERFORMED LIVE TV INTEGRITY CHECK AS PER 23-39-00, NO DEFECTS NOTED. REMOVED AND REPLACED EXTRACT FAN AS PER 21-26-51. OPS TEST OK.