As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG 2 FAULT CODE 73-31162 "THE MECHANICAL OVERSPEED PROTECTION SIGNAL IS OUT OF RANGE" LONG TIME FAULT DEFERRED PER T/C 78273000. GROUNDED - YES. PER B737-900 FIM 73-25 TASK 805 PERFORMED ENGINE RUN ON #2 ENGINE NO FAULTS NOTED PERFORMED BITE TEST OF EEC #2 NO FAULTS. NO RECENT, NO FAULT HISTORY.