What was found
LEFT MAIN GEAR LIGHT FAILED TO ILLUMINATE, RECYCLED GEAR AND FAILED AGAIN. WHILE TRYING TO GET BULBS OUT, ONE LIGHT ILLUMINATED. PUT GEAR DOWN, GOT NORMAL INDICATION BACKED UP WITH GROUND PROXIMITY SWITCH. FOUND BOTH LEFT MAIN LANDING GEAR SAFE BULBS HAD DEFECTIVE CONTACTS. RELAMPED, OPS CHECKED GOOD IAW GMM CHAPTER 6 SECTION 12-01 PAGE 37.