As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN MAIN LANDING GEAR HANDLE WAS DOWN SELECTED, MAIN LANDING GEAR WOULD NOT EXTEND 2 AMP CB POPPED. CREW FOLLOWED PROCEDURES MANUALLY EXTENDED LANDING GEAR. GOT 3 GOOD DOWN AND LOCKED INDICATIONS. LANDED WITH NO FURTHER INCIDENT. REMOVED AND REPLACED MOTOR POWER PACK, OPS CHK NML P/N 571302 S/N 1320A.