What was found
CAPT'S ELECTRIAL ALTIMETER IS FAULTY, RETURNED TO FIELD. SELECTED ALTERNATE STATIC FIXES PROBLEM. FL340 CAPTAIN'S ALTIMETER FLUCTUATES + OR - 20 FT WHILE FIRST OFFICERS READS 34240 FT STEADY. FL280 CAPTAIN'S ALTIMETER STILL FLUCTUATES + OR - 20 FT AND FIRST OFFICERS READS 28280 FT STEADY, EICAS ALTIMETER DISAGREE ALSO. PUMPED UP SYSTEMS AND FOUND CAPTAIN'S READING 60 FT HIGH. REPLACED CAPTAIN'S ADC AS PER MM, ALL GOOD. TEST 30 GOOD REMAINS FULLY CAPABLE.