I have a 2000 F750 with 3126. Chassis was built by E-One as fire pumper. ECM recently lost programming. Local CAT dealer only had 'generic' software. E-One cannot provde exact software either. Service Engine Soon light on, no tach display on dash, fire pump doesn't work. Need correct ECM software for VIN 3FDXF75R6YMA08864, engine 8YL05353.