What was found
APPROACHING LEVEL AT F330 ENTERED ICING CONDITION, TURNED ON ALL ANTI-ICE AND GOT THE FOLLOWING ALERTS, LEVEL TWO BLEED AIR 2 FAULT LEVEL ONE BLEED AIR 1 OFF", PACK 1 OFF", PACK 3 OFF "AVIONICS FAN OVRD", "BLEED AIR 3 OFF. SYNOPTIC CONFIRMED ONLY NR 2 SYSTEM BLEED OPEN AND TEMP INDICATED 247 DEG, PRESSURE 22, TURNED OFF ANTI-ICE, ALL RETURNED TO NORMAL. TURNED ANTI-ICE BACK ON AND ALL ALERTS REAPPEARED. REMOVED AND REPLACED ESC IAW AMM 21-08-01-4. REMOVED AND REPLACED PSC NR 1 IAW 36-10-02-4. REMOVED AND REPLACED HIGH STAGE PILOT VALVE LT SIDE IAW AMM 36-11-20-4. OPERATED ENG BLEED VALVES, ENG , WING AND TAIL ANTI-ICE OPERATED. NO FAULTS FOUND.