As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD FLT 5796 THE CREW REPORTED AFTER LIFTOFF A LOUD BANGING NOISE WAS HEARD FROM THE NOSE GEAR AREA, ALSO THE NOSE GEAR LIGHT CONTINUED TO CYCLE. MAINTENANCE INSPECTED AND REPLACED THE LEFT MAIN GEAR UPLOCK PROXIMITY SWITCHES. OPERATIONAL CHECKS WERE GOOD.