What was found
FORWARD EXHAUST EQUIPMENT COOLING FAN CIRCUIT BREAKER TRIPPED IN FLIGHT. OCCURED WITHIN 15 SECONDS OF UNUSUAL FAN NOISE AND BURNING ELECTRICALL ODOR. COMPLIED WITH CONDITIONAL INSPECTION 05-51-56. NO FAULTS WERE NOTED, NO BURNING ODOR OR EVIDENCE OF BURNING AND ARCING AT FORWARD EXHAUST EQUIPMENT FAN. REMOVED AND REPLACED THE AIR RECIRCULATION FAN IAW AMM 21-58-06. OPERATIONAL CHECK SATISFACTORY. NO DEFECTS NOTED. FAULT NOT DUPLICATED. AIRCRAFT RELEASED TO SERVICE.