As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT REVERSER ISOLATION VALVE EICAS THE LEFT THRUST REVERSER ISOLATION VALVE HAS A FAILURE. L REV ISLN VAL EICAS MSG ON LANDING. TR WOULD NOT DEPLOY. TS REF FIM 78-34-00-815-807 NOO. FOUND ISOLATION VALVE PLUG DIRTY. CLEANED PLUG. VERIFIED NO LTS ON TR RELAY MODULE. OPERATED TR THROUGH 10 CYCLES AND ALL INDICATIONS NORMAL. NO MSGS