As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT THE GATE, AFTER ENGINE #2 WAS SHUT DOWN NORMALLY ENGINE FAIL APPEAR IN EGT DISPLAY. GROUNDED - YES. REMOVED F/O #2 ENGINE START BRAKE ASSY, REMOVED BOTH CAPT AND F/O CHAIRS REF B737-900 AMM 76-11-10-010-801-F00. NEW PART WAS DEFECTIVE, HARNESS MISMATCHED. INSTALLED ENGINE START BRAKE ASSEMBLY REF AMM TASK 76-11-10-420-801-F00. OPERATIONAL CHECK GOOD. AIRCRAFT OK FOR SERVICE.