What was found
DIVERTED DUE TO L ENGINE MAINTENANCE DURING CRUISE FLIGHT. CREW RAN CHECKLIST AND ENCOUNTERED A NO DISPATCH MESSAGE. AIRCRAFT LANDED WITHOUT INCIDENT AT KCGF. CMC MESSAGE IS: FMU/OPCOIL (B)/RNG. FAULT TYPE: INTERNAL HARDWARE. FAULT CODE: 73299ENGLB. DESCRIPTION: ENGINE FADEC_LB CH B INDEPENDENT OVERSPEED PROTECTION CROSS SOLENOID FAILED. QRH STATES: DO NOT DISPATCH. REPLACED FMU IAW G450 AMM 73-21-03. OPS AND LEAK CHECK GOOD.