As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE PREFLIGHT CHECKS, IT WAS NOTED THAT THE LT THRUST REVERSER ACCUMULATOR LOST THE PRE-CHARGE. TROUBLESHOOTING IDENTIFIED THE LT THRUST REVERSER ACCUMULATOR AS DEFECTIVE. THE UNIT WAS REPLACED AND THE ACFT WAS RETURNED TO SERVICE. PN 60967-1, OFF SN EFS1971.