As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF LG WOULD NOT RETRACT. PERFORMED QRH & RETURNED TO AIRPORT. NON O/W LANDING. DIRT DEBRIS FOUND IN & UNDER MANUAL GEAR EXTENSION FLOOR PANEL, SWITCH WAS NOT MAKING & BREAKING. REMOVED DEBRIS FROM MAN GEAR EXTENSION SWITCH, JACKED ACFT IAW AMM 07-11-01 & 32-09-00. SWUNG GEAR SEVERAL TIMES IAW AMM 32-34-00. OPERATIONS CHECKED NORMAL. IDT PERFORMED, OK TO CONTINUE.