As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE INSPECTION, CRACKS WERE DISCOVERED IN THE TOP SKIN OF THE LEFT HORIZONTAL STABILIZER BEGINNING UNDER THE DE-ICE BOOT TRAVELING AFT ALONG THE ROW OF RIVETS AT STA 87 TO THE FORWRD J-CHANNEL. SI NR 0131-130 HAD BEEN PREVIOUSLY C/W. SUBMITTER SUGGESTED POSSIBLE CAUSE AS VIBRATION DUE TO SLIP STREAM.