On Thu, 17 Mar 2016 19:57:11 +0100, Look165 wrote:

This type of caps is known for drying inside with time.

Yes, I know. But these are not faulty. I tested them with one of these
meters:

http://www.peakelec.co.uk/acatalog/jz_esr70.html

Current most likely possibility is shorting between PCB traces due to
growths of some kind:

https://www.flickr.com/photos/128859...in/dateposted-
public/