As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENTERED FOR CREW. WHEN GEAR LEVER WAS PUT TO UP THE 3 GREEN AN D 3 RED STAYED ON. RAN QRH WITH NO HELP. CYCLED ALT GEAR HANDLE DOOR AND THE GEAR CAME UP. RETURNED BACK TO EWR. PERFORMED FIM TASK 32-30-00-810-815. REMOVED DEBRIS FROM MANUAL EXTENSION ACCESS DOOR RECESS. JACKED AIRCRAFT AND SWUNG GEAR SEVERAL TIMES. LANDING GEAR GREEN AND RED LIGHTS OPERATE NORMALLY AS PER STEP E (12) (A). TASK COMPLETED AND ACFT RETURNED TO NORMAL CONFIG.