What was found
LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF GREEN AND RED LIGHTS ALL ILLUMINATED. DEBRIEFED CREW ON ARRIVAL. LANDING GEAR DID NOT RETRACT WITH GEAR HANDLE IN UP POSITION. ALL 3 GEAR INDICATIONS ON FWD PANEL RED. ALL 3 AUX GEAR INDICATIONS ON OVHD PANEL GREEN. CYCLED MANUAL EXTEND DOOR 3 TIMES. NO JOY. PSEU LIGHT REMAINED EXTINGUISHED DURING RETURN. MX ACCOMPLISHED PSEU BITE. NO ACTIVE FAULTS. NO FAULTS IN HISTORY. R & R LANDING GEAR MANUAL EXTENSION SYSTEM ACCESS DOOR SWITCH IAW AMM 32-34-11-820-802. OPS CHECK & ADJUSTMENT GOOD. PERFORMED LANDING GEAR OPS TEST IAW AMM 32-32-00-710-801 ALL OPS CHECK PASSED. OK FOR SERVICE.