As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORT TERM FAULT 75-30602 (TBV POSITION SIGNALS DISAGREE) FOUND WHILE ACCOMPLISHING ASA T/C 78283000 FOR ENG #2. GROUNDED - YES. REMOVED AND REPLACED #2 ENGINE EEC. GROUND VERIFICATION PASS. REF B737-800 AMM 73-21-60-000/400-801-F00 FAULT NO LONGER EXISTS.