What was found
READS LOWER THAN ACTUAL ALTITUDE AND ERRATIC. FOUND PRECISION EQUIPMENT VOLTAGE TO EITHER DOUBLE OR HALF WHEN AMPLITUDE IS CHANGED. FOUND PROBLEM TO BE ON CAL/LOOP BOARD. REPLACED INTEGRATED CIRCUITS I501,I502,I503,I504,I505,I507,I508, TRANSISTORS Q501 THROUGH Q512; DIODES CR503,CR521,CR508;CAPACITORS C506 AND C520. REPLACED CAL/LOOP BOARD. REPAIRED. REPLACED RESISTORS R518,R519,R534 AND R260 TO INCORPORATE MOD 10 AS PER KING SERVICE BULLETIN KRA-405-10. BENCH CHECK GOOD.