As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING FLAP ALTERNATE POWER AND DRIVE TEST, IAW AMM 27-51-00. CIRCUIT BREAKER TRIPPED AT P6-4 D21 ALTERNATE FLAP MOTOR. SUSPECT MOTOR BAD. HEATS UP DURING START THEN BREAKER TRIPS. WIRE CHECKS, FOUND GOOD. T/E ALTERNATE MOTOR REMOVED. REPLACED T/E ALTERNATE FLAP DRIVE IAW MM, OPS CHECKED GOOD.