What was found
BOS - FLT 147 - DURING APPROACH TO BOS WHEN LANDING GEAR EXTENDED, LEFT MAIN LANDING GEAR GREEN LIGHT DID NOT ILLUMINATE WITH EICAS AND ALL OTHER INDICATIONS NORMAL. ACCOMPLISHED TOWER FLY-BY AND CONFIRMED ALL LANDING GEAR EXTENDED. AIRCRAFT LANDED BOS WITHOUT INCIDENT. REPLACED INTEGRATED CIRCUIT MODULE BOARD FOR LEFT MAIN LANDING GEAR. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)