As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE FLYING AT 170 KIAS, THE PILOT NOTED HE HAD TO REDUCE POWER TO MAINTAIN 170 KIAS. SHORTLY AFTER THAT THE AIRCRAFT`S (STICK SHAKER) ACTIVATED. INSPECTION REVEALED SEVERELY DETERIORATED PLASTIC TUBING FROM FWD PRESSURE BULKHEAD TO AIR DATA COMPUTER. LINES WERE REPLACED. (K)