As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND .8750 INCH CRACK ON LEFT UPPER TAILBOOM ATTACHMENT CHANNEL DURING A ROUTINE 100 HOUR INSPECTION. THE CRACK WAS ONLY VISIBLE WITH REMOVAL OF THE TAILBOOM ACCESS PANEL AND THE USE OF AN INSPECTION MIRROR. THE CAUSE OF THE CRACK IS NOT YET DETERMINED. (X)