What was found
DURING TAKEOFF LFPG AT 70KTS HYD BLUE SYSTEM LOW PRESSURE ECAM ALERT. REJECTED TAKE OFF. (PRESSURE A ND QUANTITIES APPEARED NORMAL,ECAM ALERT DISAPPEARED. UPON SUBSEQUENT FLT CONTROL CHECK ECAM ALERT REAPPEARED. T/S IN PROGRESS GOT BLUE SERVO LOW PRESSURE ECAM ALERT(LVL2) WHEN BLUE SYSTEM IS DEPRESSURISING (PTU OFF), BUT DIDN`T GET THIS ALERT WITH YELLOW OR GREEN. RECEIVED BLUE SERVO LOW PRESSURE ECAM ALERT WITH NO HYD PRESSURIZED. SWAPPED BOTH FWC'S PER MM 31-53-34-4. NO HELP, TRIED TO INSTALLED NEW FWC IN NR 1 AND THEN IN NR 2 POS, STILL NO HELP. CHECKED GROUND ON BLOCK AE PIN 3F ON FWC NR 1 AND 2 FOUND OK. CHECKED GROUND ON BLOCK AB PIN D 4D ON FWC NR 1 AND 2 FOUND OPEN REF ASM 27-14-00 SCH 7. CHECKED PRESSURE SWITCH 29WW, FOUND CONTINUITY BETWEEN PIN B AND C WHEN IT SHOULD BE BETWEEN PIN A AND B (WITHOUT HYD POWER) AS PER ASM 29-32-00 SCH1 P102. R&R'D PRESS SWITCH 29WW (BLUE LOW PRESSURE SWITCH) PER MM 29-12-12-4. "BLUE SERVO LOW PRESSURE" DISAPEARED. PRESSURIZED HYD WITH PTU'S, ALL INDICATIONS NORMAL. RAN BOTH ENG PER JRH, ALL INDICATIONS REMAINS SATISFACTORY, NO ALERT SHOWED. ACFT OK TO CONTINUE.