What was found
ON TAKEOFF AT 80KTS - F/O'S PFD SHOWED "0" AIRSPEED, CAPTAIN'S PFD AND BOTH STBY AIRSPEED INDICATORS SHOWED 80KTS. FOUND F/O'S PITOT TUBE PARTIALLY BLOCKED. CLEANED BLOCKAGE, REF MM 34-11-15-04 , PERFORMED PRESSURE TEST ON PITOT SYS. OPS CHECK NORMAL. ACFT REMAINS RVSM REF GMM 6-5-490, ACFT OK FOR SERVICE.