As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHLIE PERFORMING T/C 78273000 FOUND MAINT MESSAGE 77-20872. THE TOP LT EGT SIGNAL IS OUT OF RANGE. THIS IS AN ECONOMIC FAULT. ON THE NR 2 ENGINE. ACFT GROUNDED. REPLACED S4 EGT PROBE REF MM 77-21-01-400-801-F00. OPS CK GOOD REF MM 73-21-00-700-804-F00.