What was found
SEA - AFTER GEAR RETRACTION THE RED UNSAFE LIGHT AND LEFT DOOR AMBER LIGHT REMAINED ILLUMINATED FOR 6-8 SECONDS THEN WENT OUT. FERRIED TO PDX FOR REPAIRS. PERFORMED NUMEROUS GEAR SWINGS AT VARIOUS HYD MULE FLOW RATES. NO ABNORMAL GEAR INDICATIONS, BOTH MLG RETRACTED AT THE SAME RATE. REMOVED AND REPLACED NR 1 MLG RETRACTION ACTUATOR AS A PRECAUTIONARY MEASURE REF W/O 72187 T/C SB84-32-55 FOR REPLACEMENT OF MLG RETRACTION ACTUATOR. C/W OPS TEST OF THE LG PRIMARY EXT AND RET SYSTEM IAW MM TASK 32-31-00-710-801. ALSO C/W OPS TEST OF THE ALTERNATE EXTENSION SYSTEM IAW AMM TASK 32-34-00-710-801. BOTH OPS CHECK GOOD. NO DEFECTS NOTED. RETURNED TO SERVICE.