Tin whiskers are NOT unusual, and have been a problem even where no solder is involved.
http://nepp.nasa.gov/whisker/
http://nepp.nasa.gov/whisker/photos/index.html
Assertions that NASA determined that there was no electronic cause for the problem were from a preliminary report (Feb. 2011), a later report (Sept. 2011) changes all that:
http://nepp.nasa.gov/whisker/reference/tech_papers/2011-NASA-GSFC-whisker-failure-app-sensor.pdf
As I have been saying all along, regardless of what caused of the “unintended acceleration”, the underlying problem with Toyotas was the fact that there was no brake override of the throttle, a problem that was quietly fixed during the course of the recalls.
This problem (and the solution) was demonstrated in this video:
http://www.youtube.com/watch?v=VZZNR9O3xZM
All this stuff about the government “going after” Toyota is just hot air.
Toyota DID have a problem, and now they have fixed it.
Interesting. I didn’t know you could lose your power assist if you let your foot off the brake in a situation like that.