What was found
AFTER TAKEOFF, ALL GEAR INDICATIONS REMAINED UNSAFE AFTER GEAR HANDLE WAS RAISED AND CHECKED IN, BOTH FRONT AND BACK PANELS. FOLLOWED QRH, CYCLED THE GEAR AND ALL LIGHTS WENT OUT. CONTINUED FLIGHT. TROUBLESHOT IAW DC10 TAFI CHAPTER 32-30-00, FAULT CODE-AA. NO GEAR WARNING HORN WHEN GEAR HANDLE IS PULLED OUT, PROXIMITY ELECTRONICS UNIT DETERMINED TO BE BAD. REMOVED AND REPLACED PROXIMITY SWITCH ELECTRONICS HOUSING IAW DC10-10 MM CHAPTER 32-61-01-2. ALL TESTS/CHECKS PASSED.