As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT NR 1 ENGINE VALVE CLOSED. LIGHT ILLLUMINATED BRIGHT. PERFORMED FIM TASK 73-06 TASK 804. FOUND HPSOV POSITION SWITCH AT THE HMU FAILED. R & R NR 1 ENGINE HMU IAW MM REF 73-21-10-000-801-F00 AND MM REF 73-21-10-400-801-F00.