As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS RT REVERSER ISOLATION EICAS MSG & REV ISOL LIGHT ILLUMINATED AFTER ENGINE START. ALL CB' S ARE IN AND NO MESSAGES ON EPCS PG. AIRCRAFT RETURNED TO GATE. PROG TEXT: ITEM ROLLED FORWARD. RIGHT ENGINE REVERSER LOCKED AS PER MEL 7831D. ACCOMPLISHED TROUBLE SHOOTING OF NR 2 ENG THRUST REVERSER SYSTEM PER FIM 78-34-00,ACCP TR OPS CHECK PER MM 78-31-00, RAN ENG NO FAULTS FOUND.