What was found
PILOT REPORTED THAT UPON EXTENDING THE GEAR THE LANDING GEAR CIRCUIT BREAKER TRIPPED, RAN MANUAL GEAR EXTENTION CHECKLIST, GEAR EXTENDED NORMALLY, A HIGH PITCH NOISE WAS HEARD FROM THE WHEEL WELL AFTER PARKING AT THE GATE. MX FOUND THE POWER PACK RUNNING, REPLACED K3 RELAY, OPS CHECKED GOOD.