What was found
AFTER TAKEOFF, AND GEAR RETRACTION, RECEIVED AN ECAM WARNING FOR LG POS DET SYS 1 FAULT. ACCOMPANIED WITH A RT MAIN LANDING GEAR RED UNLOCK WARNING LIGHT. THESE WARNINGS WERE PRESENT IN SYS 1 AND 2. ON GEAR EXTENTION ALL GEAR DOWN INDICATIONS WERE NORMAL. AIR TURN BACK. FOUND THE NR 1 SYSTEM MICROSWITCH WAS BAD. TROUBLESHOT IAW ASM 32-61-00, REMOVED AND REPLACED THE UPLOCK SWITCH 32 GB IAW AMM 32-00-0-0401. OPS CHECK OK.