You cannot determine the probability of such a fault. It is uncertain what it is caused (not so sure that is caused by software bug - my opinion), not enough cases, etc. The best you can do is update the PCM, drive and monitor.
I will try soon to confirm the method of checking the arm using an endoscopic camera and post information here on the forum.
I already have a camera with a rigid cable, maybe I will start doing it today.
I believe that some uncommon driving conditions was met to cause this problem. I have already updated PCM and only hope that these conditions were not met BEFORE software update...
Is it possible to access undercover of engine without it disassembling?
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