What was found
FLIGHT 9003, SELECTED LANDING GEAR DOWN & NO GREEN LEFT LANDING GEAR ILLUMINATED, RAN CHECKLIST WITH NO SPARE BULBS, PULLED BULBS FROM RIGHT MAIN GEAR & PLACED INTO LEFT GEAR, HAD FA VERIFY GEAR WAS DOWN & CONDUCTED LOW APPROACH FOR TOWER VERFICATION, LANDED ON GROUND & BOTH LEFT & RIGHT MAIN LIGHTS WERE OUT. CORECTIVE ACTION: UPON INSPECTION OF LEFT AND RIGHT MAIN GEAR ANNUNCIATOR LIGHTS FOUND MULTIPLE BULBS BURNT OUT, REMOVED AND REPLACED BULBS OPS CHECK GOOD IAW SAAB AMM 33-12-05-02.