As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NR 5161 ENROUTE, PILOTS REPORTED THAT THE GEAR WOULD NOT EXTEND. PILOTS USED ELECTRICAL EXENTENSION PROCEDURES TO LOWER THE GEAR. MAINT REMOVED AND REPLACED THE (A) SYSTEM DOWLOCK PROXIMITY SENSOR IAW. MM 32-61. OPERATIONAL CHECK WAS GOOD. RII INSPECTION COMPLIED WITH IAW TASKCARD 4.3.8. PN OFF 922AA2Y-A6P-2722A.