What was found
LEFT DOOR AMBER LIGHT AND LEFT RED GEAR DOOR LIGHT REMAINED ILLUMINATED FOR APROX 1 MIN AFTER GEAR HANDLE SELECTED UP, THEN THEY EXTINGUISHED AND REMAINED OUT. FERRIED FOR REPAIRS. REMOVED SECONDARY MLG SELECTOR VALVE FILTER FITTINGS IAW AMM 29-21-06-000-802 STEP 3C NOT REQUIRED, INSTALLED FILTER FITTINGS IAW 29-21-06-400-802 STEP 5A NOT REQUIRED. NO RII REQUIRED, OP CHECK GOOD. RETURNED TO SERVICE.