As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HORIZONTAL STAB BALL SCREW INSPECTION FAILED IAW J/C 27-030-01. REPLACED HORIZONTAL STABILIZER ACTUATOR. STAB TRIM ACTUATOR ASSY SENT OUT ON R/O 501586374 TO REPAIR VENDOR DELTA AIRLINES INC. REASON FOR REMOVAL STATED AS JACKSCREW PITTED. UNIT WAS EXCHANGED.