How did you explain timing belt repair to judge in court?

What is your question?

The Consumer Protection (CP) folks communicated with the mechanic couple of times. They felt I have a case. They suggested an arbitration . I agreed to it, but my mechanic turned down. CP suggested to take it to court. My mechanic determined my car's (1999 Camry 2.2 engine, 84K miles, no issues before this incident) timing belt had slipped off the spindle. He Steered towards engine replacement. It was a long story. I talked to my lawyer, who feels we need competent person to explain timing belt slipping situation on non-interference engine & does not need engine replacement for this situation, but timing belt repair fix the issue to judge in court. This person need have life experience of repairing timing belts. Credibility is key when presenting my case, he has to be good at explaining the mechanics of the engine to a lay person and able answer judge's questions. Where/how can I find such competent person, who is willing to explain to judge in court? Thanks for sharing.