As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4158 - SHORTLY AFTER TAKEOFF, THE FIRST OFFICER NOTICED AIR SPEED AND ALTIMETER INDICATORS WERE FLUCTUATING APPROXIMATELY 100 KNOTS. AIRCRAFT RETURNED TO FIELD, LANDED WITHOUT FURTHER INCIDENT. PIT MX ACTIVATED PITOT STATIC HEAT SYSTEM TO MELT ICE ACCUMULATION. GROUND CHECKED GOOD, AIRCRAFT RETURNED TO SERVICE. (X)