B737-800
Maintenance Airframe; Maintenance Powerplant
Situational Awareness; Time Pressure
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Gate
Manuals; Human Factors; Procedure
Aircraft returned to the gate for both engines [had] no rotation. Debriefed crew; [started engine] #1; operations normal. [Tried to start] #2 with no rotation. Removed Starter and confirmed shaft had sheared. No starter [was] in stock. Part was robbed from another AC (Aircraft); serviced and installed. Dry motored engine. Completed ELB (Electronic Logbook) and dispatched flight. I did not notice an additional step in the AMM (Aircraft Maintenance Manual).When an AMM has caution or warning boxes they are highlighted in red and white or yellow and black colored ink. When we print out the AMM the printer is black and white. A colored printer would have brought this greater visibility.
Maintenance Technician reported missing an additional step in the replacement of an engine starter.