What was found
FLT NR 1834 - TPA - THE LEFT AND RIGHT MLG GREEN DOWN AND LOCKED INDICATION LIGHTS DID NOT ILLUMINATE AFTER LANDING GEAR EXTENSION ON APPROACH TO TPA. A VISUAL INSPECTION CONFIRMED THE GEAR WAS DOWN AND LOCKED. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND A FAILED MASTER DIM AND TEST MODULE CIRCUIT CARD. THE MASTER DIM AND TEST MODULE CIRCUIT CARD WAS REMOVED AND REPLACED IAW MM 33-15-11. ALL GEAR INDICATIONS CHECKED NORMAL. (M)