What was found
AT APPROX 50 KTS TAKE WARNING HORN ACTIVATED CONTINUOUSLY. ABORTED TAKEOFF. POST ABORT CHECK SHOWED ACFT PROPERLY CONFIGURED. PRE TAKEOFF T/O WARN TEST OK. POST ABORT T/O WARN TEST OK. PERFORMED FUNCTIONAL TEST OF T/O WARNING SYS AND THEN INTROGRATED CDS FOUND FAULT "PILSW FAULT". REMOVED AND REPLACED HANDWHEEL ELEVATOR-TRIMSWITCH IAW AMM TASK 27-32-18-000-801 & 27-32-18-400-802. PERFORMED OPS TEST OF ELEVATOR PITCH TRIM SYS IAW AMM TASK 27-32-00-710-802 AND RIL 84-27-057. RETURNED TO SERVICE.