What was found
SJU - FLT 7109 - AFTER TAKEOFF, IN CRUISE CREW HAD A FAULTY GEAR INDICATION ON APPROACH TO STU TWO ATTEMPTS TO EXTEND THE LANDING GEAR NORMALLY FAILED. EXITED THE TRAFFIC PATTERN CALLED FOR A MISSED APPROACH, EXTENDED THE GEAR ALTERNATELY AND LANDED SAFELY. REMOVED AND REPLACED PROXIMITY SWITCH, AND OPERATIONAL TEST LANDING GEAR RETRACTION, AND EXTENSION SYSTEM SUCCESSFULLY. (M)