What was found
ON TAKEOFF, FO'S AIRSPEED, ALTIMETER AND VSI VERY ERRATIC. ALTIMETER AS MUCH AS 1,500 FEET BEHIND CAPTAINS. AIRSPEED INDICATOR 0 KNOTS MOST OF THE TIME. RETURNED TO SEA. COPILOTS IAS INDICATOR HAS A STATIC LEAK. REMOVED AND REPLACED COPILOTS IAS INDICATOR IAW MM 34-12-01. TESTED IAW MM 34-11-00. OPS CHECKS GOOD.