What was found
AIRCRAFT DIVERTED INTO KPSC DUE TO SMOKE WARNING ANNUNCIATOR ILLUMINATION. THE AIRCRAFT LANDED WITHOUT INCIDENT. NO SMOKE WAS NOTED VISUALLY UPON LANDING. MX RAN BOTH ENGINES TO TAKE OFF POWER, NO ALARM, PRESSURIZED AIRCRAFT ON THE GROUND LEAVING POWER ON FOR APPROXIMATELY 40 MINUTES, NO ALARM. MOVED, SHOOK, AND WIGGLED SMOKE DETECTORS, NO ALARM. REMOVED HEADLINER AND CONDUIT COVER AND SHOOK SMOKE DETECTOR WIRES ALL THE WAY FRONT TO BACK WITH NO ALARM THEN CLEANED AND INSPECTED ALL 4 SMOKE DETECTORS, ALL DETECTORS TESTED GOOD INDIVIDUALLY. SYSTEM OPS CHECK GOOD. RETURNED AIRCRAFT TO SERVICE.