What was found
DIVERTED, IN CRUISE HAD FAINT ODOR OF HOT-BURNING PLASTIC WITH LOUD BINDING NOISE IN COCKPIT. NO FUMES DETECTED IN FWD GALLEY. WHEN NOISE BECAME LOUDER FUMES GOT WORSE. FOUND EXTRACT FAN AT FAULT, R & R AVOINIC EXTRACT FAN IAW MM 21-26-51, AEVC TEST PASSED, NO FAULTS.