As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3755: AFTER HOLDING AT LOW ALTITUDES FOR OVER AN HOUR, IN CONSTANT LITE RAIN/SNOW - RECIEVED EFIS COMP MON CAUTION AND IAS YELLOW FLAGS ON BOTH PFD'S AIRSPEED 8-10 KNTS WITHIN 10-15 MINUTES, 20 KNOTS OFF. DETERMINED THAT CAPT'S AIRSPEED WAS MOST ACCURATE. AFTER LANDING/TAXI. IN PROGRESS.