What was found
RTO AT APPROX 70KTS DUE TO LEFT ENG HIGH STAGE LT ILLUMINATING. REPLACED LT ENGINE HPSOV AND HIGH STAGE PILOT VALVE, NO HELP. CONTINUING TO TROUBLESHOOT, NR 1 ENG READS 4 PSI, NO HIGH STAGE AFTER HIGH STAGE AND PILOT VALVE REPLACEMENT AT IDLE. BLEED LIGHT STAYS ON. 1-12 FOUND K10197 LEFT PRSOV VALVE OFF RELAY INOP. REPLACED RELAY K10197. WILL REQUIRE TEST OF LEFT HIGH STAGE BLEED AIR. ACP'D PNEUMATIC HEALTH CK ON NR 1 ENG, ON THE FOLLOWING COMPONENTS. HPC, HPSOV, PRSOV, PRC, AND FAMV. ALL COMPONENTS PASSED. ACP'D PNEUMATIC SYS TEST ON NR 1 ENG. ALL PARAMETERS WITHIN LIMITS.