As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT LOST AIRSPEED INDICATION ON A POST 91 FLIGHT. AIRCRAFT RETURNED, FOUND PITOT TUBE SLIPPED OUT FROM B-NUT AT T-FITTING, BEHIND INTERIOR PANEL ON RT SIDE, APPROXIMATELY AT FRAME 23. SUSPECT TUBING INSERT WAS NOT INSERTED FAR ENOUGH INTO TUBING DURING MANUFACTURE. (K)