What was found
PILOT REPORTED THAT ON GEAR EXTENSION, RT MAIN H FAILED TO ILLUMINATE, RT ANNUNC ILLUMINATED AS NORMAL. PRECAUTIONARY RAN CHECKLIST & ALL ILLUMINATED. OPERATIONS CHECKED NORMAL. TROUBLE SHOT SYS, R & R MLG 3 GREEN ANNUNC ASSEMBLY IAW BMM 31-10-00. PN 90-412291-2 ON & OFF SN INSPECTED & CLEAN DOWNLOCK SWITCHES.