As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL THREE GEAR WOULD NOT RETRACT AFTER TAKEOFF. INDICATION WERE ALL THREE GREEN LIGHTS AND ALL THREE RED LIGHTS WITH HANDLE UP. RON QRH CHECKLIST AND RETURNED TO EWR. FOUND MANUAL EXT SYSTEM ACCESS DOOR SWITCH AT FAULT REF. N/R 4419990 FOR PART CHANGE & OPS CHECK.