As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING TASKCARD 78273000 FOUND MESSAGE NR 73-20202 INTERNAL EEC FAULT LONG TIME FAULT DEFERRED, PER T/C 78273000 ON ENGINE 2. GROUNDED-YES. REF B737-800 FIM TASK 73-21 TASK 801 FOR FAULT CODE FAULT CODE IS 73-20202, MAINTENANCE MESSAGE DOES NOT SHOW ON THE FMCS CDU ON THE LAST 10 CYCLES. VERIFIED NO HISTORY ON THIS FAULT.