As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PRE-FLIGHT, PILOT NOTICED TWIG STICKING OUT OF TAILCONE. MAINTENANCE PERSONNEL REMOVED TAILCONE AND FOUND ENTIRE HORIZONTAL STABILIZER FILLED WITH BIRD'S NEST. STABILIZER WAS PART OF STABILATOR ASSY AND OUT OF BALANCE. INSPECTED 2 OTHER LIKE AIRCRAFT PARKED ON SAME RAMP FOUND IN SAME CONDITION. SUGGEST COVERING LIGHTENING HOLES WITH SCREENS.