As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE OIL PRESSURE LIGHT ON AFTER TAXI, OIL PRESSURE NORMAL AT 28 PSI. AC RETURNED TO GATE (BTB) AND MTX GROUNDED AC . MTX DEFERRED RH ENGINE OIL PRESSURE LIGHT INDICATION IAW MEL ABX-79-33-1-1 . AC REMAINS NO ETOPS . MTX RETURNED AC TO SERVICE.