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, #2 ENG EEC SHOWS "CH A EEC DATA NOT AVAILABLE". GROUNDED - YES. REF B737-800 AMM 73-21-60, REMOVED/REPLACED #2 ENG. EEC. OPS CHK GOOD REF SAME AMM. ALL TESTS GOOD. NO SOFTWARE LOAD REQUIRED. GROUND VERIFICATION TEST GOOD.