What was found
BOTH MLG GREEN INDICATION LIGHTS DID NOT ILLUMINATE WHEN LG WAS EXTENDED ON APPROACH. THE AIR/GROUND RELAY AND LIGHTS CB WAS FOUND TRIPPED DURING GO-AROUND. THE CB WAS RESET AND BOTH MAIN GEAR RED AND GREEN LIGHTS ILLUMINATED. THE CHECKLIST FOR UNSAFE GEAR WAS CONTINUED. THE GEAR WAS EXTENDED MANUALLY AND THREE GREEN LIGHTS WERE INDICATED. MX COULD NOT DUPLICATE THE FAULT. A MLG AND NLG EXTENSION/RETRACTION ADJUST/TEST WAS PERFORMED IAW MM 32-32-00, PAGE 501 AND MM 32-33-00, PAGE 501. A LANDING GEAR POSITION INDICATION AND WARNING SYSTEM ADJUSTMENT/TEST WAS PERFORMED IAW MM 32-61-00, PAGE 501. ALL CHECKS WERE GOOD.