As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3084 - DCA-PHL - AFTER GEAR RETRACTION, THE LEFT MAIN RED GEAR LIGHT CYCLES ON AND OFF CONTINUOUSLY. LOUD BANGING NOISE COMING FROM THE NOSE GEAR AREA. THE AIRCRAFT TURNED BACK AND LANDED IN DCA WITHOUT INCIDENT. REMOVED AND REPLACED NR 1 MAIN GEAR PROXIMITY BOX. (M)