What was found
ALL LANDING GEAR RETRACTION DID NOT RETRACT - ON TAKEOFF GEAR WOULD NOT RETRACT. EICASS MESSAGE WOW MISCOMPARE WAS PRESENT. COMPLETED CHECKLIST. WOW EICASS MESSAGE WENT OUT ELECTED TO TRY AND RAISE GEAR. LOUD NOISE AND BANGING HEARD AS GEAR RETRACED AIRCRAFT WAS ROCKING. ELECTED TO LOWER GEAR. THREE GREEN INDICATED. WOW INDICATION STAYED OUT. UNEVENTFUL LANDING AND TAXI IN. REMOVED AND REPLACED NLG SQWAT SWITCH COMPLIED WITH SATIFACTORYRIG AND GEAR SWINGS NO FURTHER DEFECTS NOTED AT THIS TIME IAW MM 32-60-10.