What was found
AFTER AIRSTART ON #1 ENGINE- ENGINE ANTI ICE LIGHT #1 ILLUMINATED. GROUNDED - YES. REMOVED ENG 1 A/I VLV CONNECTOR AND LOOSENED LOCK BOLT. UNABLE TO MOVE VALVE TO OPEN POS. SECURED BOLT AND RECONNECTED CONNECTOR. INSPECTED #1 ENGINE ANTI-ICE VALVE, VALVE MOVES FREELY DURING WRENCH CHECK, CHECKED FOR FAULTS, FOUND FAULT "BLEED HPSOV L" INSPECTED, #1 ENGINE HPSOV AND PERFORMED WRENCH CHECK, NO DEFECTS NOTED. PERFORMED OPS TEST PNEUMATIC ENGINE ON-SYSTEM TEST REF B737-9 AMM 36-00-00. OPS TEST PASS. RAN #1 ENGINE AND OPERATED #1 ENGINE COWL ANTI-ICE VALVE NUMEROUS TIMES, VALVE WORKS NORMAL, NO ENGINE ANTI-ICE VALVE LIGHT.