As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING ASA T.C.# 78249000, APU CDU HAS MTX MSG 49-61259 SPEED SENSOR 1 SHOWS OPEN CIRCUIT ON EVERY LEG FOR 15+ LEGS IN MTX HISTORY. GROUNDED - YES. REMOVED APU SPEED SENSOR IAW B737-900 AMM 49-61-21 CLEANED AS REQUIRED. REINSTALLED APU SPEED SENSOR IAW AMM 49-61-21 APU OPERATIONAL CHECK GOOD. LEAK CHECK GOOD, APU BITE CHECK GOOD. SPEED SENSOR FAULT NOT SHOWING ON CURRENT STARTS.