What was found
CABIN DOOR ALARM CAME ON INFLIGHT AIR TURN BACK ACCOMPLISHED. IN CONCURRENCE WITH TECH, T/S PER ASM 52-73-00 SCH 02 AND TSM 52-73-00/001, FOUND DOOR LIMIT SWITCH (9WN) FAULTY, REMOVED AND REPLACED DOOR LIMIT SWITCH, OPS CHECKED GOOD IAW AMM 52-73-13/401 AND ACCOMPLISHED AIRCRAFT PRESSURIZATION FUNCTIONAL TEST IAW AMM 21-31-00/501, DOOR CONDITION CHECKS GOOD AT THIS TIME. AC OK TO CONTINUE.