As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 42 - DURING DESCENT, MLG CONTROL & INTERFACE UNIT FAULT & TRIPPED CIRCUIT BREAKER. RESET C9 CIRCUIT BREAKER BUT IMMEDIATELY POPPED. MLG WON'T EXTEND; PERFORMED GRAVITY GEAR EXTENSION & DECLARED EMERGENCY LANDING. R & R MLG CONTROL & INTERFACE UNIT IAW MM 32-31-71-PB-401. LGCIU NR 1 TESTS GOOD, NO FAULTS NOTED. WILL CONTINUE TO MONITOR FOR 10 DAYS FOR OTHER POSSIBLE FAULTS OR RELATED REPEAT DISCREPANCIES. NO RELATED FAULTS OR EVENTS REPORTED. TEARDOWN REPORT FOUND PROBLEM TO BE WITH POWER SUPPLY ASSEMBLY FILTER F5. REMOVED AND REPLACED FILTER F5.