What was found
FLT 745 MCO-SJU, AIR RETURN TO MCO DUE TO PASSING 16,000 FEET TAT +10 SAT 0 IN PRECIPITATION AIRSPEED VARIED WILDLY ON PFD 1. AIRSPEED INDICATIONS THEN VARIED FROM UNRELIABLE TO NO DATA TO NORMAL UNTIL BELOW FREEZING LEVEL. ALTITUDE WAS ALSO UNRELIABLE. REF TSM 34-13-00-998A, THE TECHNICIAN REMOVED AND REPLACED CAPT LT AND RT STATIC PORTS OPS CHECK NORMAL. (UPDATE) ON 7/4/11, REFERENCE LOG 708261 PILOT REPORTED THAT DURING CLIMB CAPT'S AIRSPEED LOST (RED FAIL) AND ALTITUDE OFF BY 500 FEET. THE TECHNICIAN REMOVED AND REPLACED ADIRU 1. OPS CHECK GOOD REFERENCE AMM 32-12-34.