What was found
PDIS 686 27-41 2395231 15NOV21 CLT CLOSE DECENTING THROUGH 12000 FEET. SPEED BRAKES DEPLOYED. TCS BUTTON PRESSED. IDLE THRUST. PTRIM MAIN INOP MSG WITH MATER CAUTION DISPLAYED. C/W QRH PTRIM MAIN MSG REMAINED. FACT 15NOV21 14:04 CLT REMOVED AND REPLACED HORIZONTAL STAB CONTROL UNIT I/A/W AMM 27-40-01. OPS CHECKS GOOD I/A/W AMM 27-40-00-700-802-A/500. NO MESSAGES ON EICAS AIRCRAFT OKAY FOR SERVICE.