What was found
AFTER LANDING GEAR EXTENSION, GREEN NLG LIGHTS FAILED TO ILLUMINATE. COMPLIED WITH THE LANDING GEAR WILL NOT EXTEND CHECKLIST. LANDING WAS NORMAL. AFTER LANDING, BULBS DID NOT ILLUMINATE ON ROTARY TEST. R & R BOTH NLG DOWN & LOCK LIGHT BULBS. JACKED ACFT, CYCLED LANDING GEAR AND BLED SYS, SERVICED GEAR & BRAKE BOTTLE WITH NITROGEN. ALL OPS CHECKS GOOD. WORK DONE IAW MM 33-10-01 AND 32-01-00.