As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE EGT ERRATIC FLUCUATES -50C TO 603C T/O. AIR RETURN TO DTW. MAINTENANCE REPLACED NR 2 ENGINE ECU IAW MM 77, OPS CHECK GOOD IAW MM P/N ON & OFF 2-303-493-06, S/N ON 7ALG570, S/N OFF 3AGT92 & THERMOCOUPLE HARNESS P/N ON & OFF 2-310-089-02 IAW AMM 77-00-00 PG BLOCK 501.