Maintenance Powerplant; Maintenance Airframe
Human-Machine Interface; Situational Awareness; Time Pressure; Troubleshooting; Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Maintenance
Flight Crew Returned To Gate; General Maintenance Action; General Flight Cancelled / Delayed
Procedure; Aircraft; Human Factors
Aircraft X had a #2 Engine inflight shutdown to Airport Code ZZZ1 on DATE.   ZZZ Maintenance sent a crew to ZZZ1 to replace the HMU (Hydro-Mechanical Unit); fuel pump; filters; etc.Prior to the flight an operations check sheet log states the #2 Engine will not light off.   Crew reported Spar Valve circuit breaker (C/B) popped.   The aircraft was Trouble Shot and the flight crew write up did not mention the C/B popped.   Per the sign off the Fire Handle was cycled.
Technicians reported being dispatched on a road trip to replace the HMU and other components on a B737-800; they discovered a popped circuit breaker and reset the fire handle; correcting the malfunction.