[Jim_in_PA]

s I understand it, in addition to the visual boroscope, the trans is stress tested while running diagnostics to detect chain slippage. The part that breaks, is the chain guide, which is plastic. The visual inspection will confirm the condition of the chain guide.

^^ This. The borescope inspection is necessary for this reason. The "transmission" isn't breaking from the flawed software, per se, but the chain guide is and that results in further damage. I do agree that fluid analysis is often an additional data point that can be helpful with diagnosis, of course.