As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING T/C 78273000, FOUND MSG 75-20832 "T3 SIGNAL OUT OF RANGE". LONG TIME FAULT #2 ENGINE. GROUNDED - YES. DEFERRED PER T/C 78273000 FOR REPAIR WITHIN 450 FLT HOURS. REMOVED AND REPLACED THE #2 ENG T3 (CDT) SENSOR ASSY REF B737-800 AMM 73-21-07/401. OPERATIONAL TEST PASS AND B737-800 FIM 75-33 TASK 802 FAULT REPAIR CONFIRMATION SUCCESSFUL. THIS CLEARS PLT DIFFERAL.