5CB serial number, that I can remember. Seems that the drive cuts out with a "F" displayed on dash. It happens at different times but I've really noticed it when driving in reverse in SCR speed and then releasing the accelerator pedal. Goes to "F" and shuts down. Sometimes happens when plugging too. The panel was replaced with a Cat exchange a year ago and has been running fine up til now. Someone else replaced the transistors recently when trying to cure the problem.
Any thoughts?
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