What was found
AIRSPEED UNRELIABLE MESSAGE DURING TAKE OFF AT APPROX 90KTS. CA & FO AIRSPEED DIFFERED BY 10KTS. AIRSPEED BETWEEN CA; STBY; & FO; INDICATIONS VARIED BY 5 TO 10 KTS; THEN RETURNED TO NORMAL. UNABLE TO DETERMINE WHICH INDICATOR WAS INNACURATE. / T/S PER FIM 31-62-TASK 826 FOUND LEFT PITOT TUBE CLOGGED. REMOVED + REPLACED LEFT PITOT TUBE ASSY PER AMM 34-11-01 LEAK CHK NORMAL. ISSUE# 3207739 E004777POS LH TAG 1044067 PN OFF 0851HT-1 SN OFF 332466 PN ON 232A9105-20RA PN ON 232A9105-20RA SN ON 363388