As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRSPEED INDICATORS ALL 3 STOPPED WORKING, FROZE AT FL370. ON DESCENT WENT AS LOW AS 70 KNOTS, SEEMED TO BE WORKING AS ALTIMETERS. STANDBY SEEMED TO CLEAR FIRST FOLLOWED BY CAPTAIN`S SIDE AT FL 290, THEN FIRST OFFICER`S SIDE AT FL 250. DRAINED PITOT LINES IAW AM 34-13-00 & PERFORMED ADC SYS OPERATIONAL TEST IAW AMM 34-15-00. OPERATIONS CHECKED OK.