On Wednesday, October 19, 2016 at 6:56:39 PM UTC+3, wrote:
Is it known which serial numbers actuallly had spar problem?
Conversely is it known which serial numbers were found to be ok after inspection?

I hadn't previously been aware of this and was puzzled by this message. If anyone else is in the same situation, here is a description of the problem by our own Bob K from 2007:

http://www.hpaircraft.com/misc/dg300spars.htm