What was found
DURING INITIAL COCKPIT PREFLIGHT, BLUE ANNUNCIATIOR ENG VALVE CLOSED IS IN BRIGHT ILLUMINATION ONLY. NR 1 ENGINE PRESS TO TEST FUNCTION IS NOT WORKING CORRECTLY. ACFT GROUNDED. VERIFIED DISCREPANCY REF FIM 73-06, TASK 804. FOUND AT NR 1 HMU M1823 PIN 3 MISSING OF HMU SIDE OF CONNECTOR DP1207 SUSPECT PUSHED BACK INTO HMU CONNECTOR. R & R HPSOV SWITCH IN NR 1 ENG HMU REF MM 73-21-09-000/400-801-F00. OP CHECKS NORMAL. TEST 3A, 12 AND 13 GOOD REF MM 71-00-00. HMUS QUALIFIED. RESET ENG 1 HPSOV IND C/B.