What was found
AFTER TAKEOFF RT GEAR DOOR LIGHT STAYED ILLUMINATED FOR APPROX 25 SECONDS AFTER LANDING GEAR WAS SELECTED UP. FERRY FOR REPAIR. RT AND LT GEAR DOOR LOCK LINKAGE SHIMMED, REF: IS4Q3200043. MLG ALT RELEASE CABLE RIGGING CHECK, REF:EC 6-32-527. REMOVED ,REPLACED, RIGGED, SECONDARY MLG SELECTOR VALVE. REMOVED AND REPLACED NR1 AND NR2 ALT EXTENSION ACTUATORS. FLUSHED MLG ALT EXTENSION SYS IAW TASK CARD 29-21-00-617-801. COMPLIED WITH OPS TEST OF PRIMARY EXTENTION AND RETRACTION SYS. C/W OPS TEST OF THE ALT EXTENSION SYS. NO DEFECTS NOTED. ALL OPS CHECKS WERE PERFORMED SATISFACTORY. RETURNED TO SERVICE.