As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ENG SPAR VALVE CLOSED LIGHT ILLUMINATED BRIGHT BLUE DURING CLIMB OUT. GROUNDED - YES. AIR TURNBACK -- REMOVED #1 ENG SPAR VALVE ACTUATOR PER B737-9 AMM 28-22-11-000-801. INSTALLED NEW #1 ENG SPAR VALVE ACTUATOR PER AMM 28-22-11-400-801.