As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE CAPTAIN REPORTED A 10 - 15 KTS SPLIT ON AIRSPEED INDICATIONS BETWEEN PILOT-F/O INDICATORS. MAINTENANCE INVESTIGATION REVEALED THAT THE CAPTAINS (LT) PITOT HEAD WAS RESTRICTED SLIGHTLY. FURTHER INVESTIGATION REVEALED THAT THE AIR TUBE HAD BEGUN TO EXFOLIATE INTERNALLY AT THE 90 DEGREE BEND IN THE PITOT HEAD. THE HEAD WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE. THE AIRCRAFT IS OPERATED EXCLUSIVELY ON FLOATS IN A CORROSIVE ENVIRONMENT.