What was found
DURING CLIMBOUT AT FL180, LIGHT CHOP, AFT AIRSTAIR AMBER LIGHT ILLUMINATED, AND REMAINED ON, COMPLIED WITH QRH. INSPECTED AFT AIRSTAIR WARNING INDICATION AND STAIR POSITION MICROSWITCHES IAW M/M 52-62-001-6-1, A (11). NO DEFECTS FOUND. FLIGHT CREW REPORTED NO PROBLEMS LAST 3 LEGS. CLEANED SWITCHES AND OPS CHECKED OK..