What was found
LOWERED GEAR, GOT SAFE INDICATION OF GEAR DOWN. A FEW SECONDS LATER GOT UNSAFE GEAR WARNING. LIGHT & HORN IN POS 2 SELECTED SYS 1 & THE LIGHT QAND WARNING HORN WENT OUT.. 3 GREEN DOWN INDICATIONS INSYS 1. SYS 2 HAD 2 GREEN LIGHTS FOR MAIN WHEELS AND NO GREEN, RED, OR AMBER LIGHTS FOR NOSE GEAR.GOT TOO LOW GEAR ON FINAL,DID GO AROUND,ON SECOND APPROACH ALL INDICATIONS NORMAL. AMM TROUBLESHOOTING. R & R NLG O SWITCHES ON DRAG STRUT 48 & 79 GB SYS 1 & 2. OPERATIONS CHECKED NORMAL IAW MM 32-00-00- 04 PG 19 ITEM .B.