What was found
LEFT ENGINE ANTI-ICE VALVE FAILED IN CLOSED POSITION. REMOVED AND INSTALLED ANTI-ICE VALVE IAW AMM 30-21-11 BUT FAILED OPS CHECK. AFTER FURTHER TROUBLESHOOTING THE NEW ANTI-ICE SOLENOID IS BAD FROM STOCK. REMOVED THE NEW ANTI-ICE VALVE AND MADE UNIT UNSERVICEABLE. THERE IS NO VALVES IN THE SYSTEM IN SFO. AWAITING PART FROM OTHER STATION. INSTALLED ENGINE COWL TAI VALVE IAW 737 AMM 30-21-11-400-801. OPS CHECK GOOD ADD EMP:U353045 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1186717 SN OFF 3331 VALVE, ANTI-ICE OFF 29-3021-9-0002 3331 ON 29-3021-9-0002 0306