What was found
RTO NO F/O AIRSPEED ON PFD. A/C RETURNED TO BLOCKS DUE TO NO AIRSPEED INDICATION ON F/O'S PFD. BLEW OUT PITOT TUBE FOR F/O AIRSPEED PER MM 34-11-15-6, NO DEFECTS NOTED. USED PITOT TESTER TO VERIFIY SPEED TAPE ON FO,S PFD OPERATED NORMALLY PER MM 34-11-15-6. REMOVED AND REPLACED F/O'S PITOT TUBE AND PERFORMED LEAK CHECK, AMM 34- 11-15-4. OPS CKS NORMAL. ALSO, SWAPPED NR 1 AND NR 2 AIR DATA COMPUTERS AS PRECAUTION. A/C OK FOR SERVICE.