Cant be proved whether it had a bearing on accident but the aircraft was not airworthy on a number of counts and anyone with knowledge of operating and maintaining those engines professionally will know you can't discount the thrust reduction which may have caught him out due to some other distraction which we will never know the answer to . But factually the airworthiness issue is more of an issue for the CAA than the operator as they approved the permit to fly . Read the report and you will find they rejected most of the maintenance issues before eventually being forced to accept most of them . Could be interesting in court because it should be the CAA in the dock for this even if it can't be proved it was the cause of this sad accident