As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMING T/C 78273000 FOUND #2 ENGINE MX MESSAGE 77-20872 TOP LEFT EGT SIGNAL OUT OF RANGE ECONOMIC FAULT. GROUNDED - YES. TROUBLESHOT PER B737-800 FIM 77-21. FOUND MESSAGE HAS BEEN CLEARED AT THIS TIME. NOT PRESENT IN CURRENT OR HISTORY. EEC TEST GOOD. AIRCRAFT RELEASED PROM PLT.