What was found
ON T/O AT ONT, BOTH AIRSPEED INDICATORS BECAME ACTIVE AND CK'D AT 80 KTS AT 200 FT ABOVE GRD. AIRSPEED DROPPED OFF ON APPROACH A/S WAS 40 TO 60 KTS BELOW PFD SPEED, NO OTHER PRESSURE GAUGES WAS ALT OR VSI WERE EFFECTED BOTH A/S INDICATORS SHOWED THE PROBLEM. FLUSHED STANDBY TOTAL PRESSURE SYS PER 34-1000 PG 302, LEAKED CK OF STANDBY PITOT SYS PER 34-10-0 P 548 AND 549 NORMAL.