What was found
DURING CRUISE FLT AT FL340, SMELLED AN ELECTRICAL ODOR AND HEARD A CB POP. VERIFIED CABIN FAN CB POPPED. REMAINDER OF FLT UNEVENTFUL + ODOR FREE. R&R FAN ASSY IAW MM CH 21-21-04 AND OPS CHECKED REF MM CH 21-21-04. ENGINE POWER APPLIED AND CB RESET AND A/C FAN SWITCH IN THE OFF POSITION CB DID NOT POP. WITH SWITCH IN EITHER POSITION A/C OR FAN, THE FAN CB POPPED. DID NOT SMELL ANY ELECTRICAL ODOR IN COCKPIT OR CABIN. INSTALL REPLACEMENT AFT CABIN FAN IAW AMM 21-21-04. REMOVED FAN WHEEL FROM MOTOR AND ITS MOUNTING BASE AND REMOVED THE BLOWER ASSY IAW AMM 21-21-04. INSTALL ALL REMOVED INTERIOR FURNISHINGS.