I have also read this many times on this board, but I had the feeling that all ABS units are sealed. In the AUDI/VW's case, they require careful prying open of the the case, and slicing through the sealant/glue that holds it together. I won't know until I do it, though.
The sporadic activation did feel to me as an obvious loose connection, as computer-boards don't suddenly work at lower temperatures if they have an internal de-lamination or they need to be re-balled.
A blown capacitor reduces capacitance to 4% of the original value, and this value would be even lower at low temperature, according to this page on ceramic caps (http://www.niccomp.com/Products/TC_Ceramics.pdf).