As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 3379 - ON APPROACH TO DTW, THE GEAR WOULD NOT EXTEND ON COMMAND. THE GEAR EXTENDED NORMALLY AFTER THE CREW RESET THE LANDING GEAR CONTROL CIRCUIT BREAKER. MAINTENANCE WAS UNABLE TO DUPLICATE THE DISCREPANCY. AS A PRECAUTION, THE GEAR SELECTOR CONTROL, P/N 709201-1, WAS REPLACED. SYSTEM OPERATED SATISFACTORILY. (M)