Quoted from AMSNL:Thank you . As soon as a lawyer letter will hit my mailbox , I will seek legal advice. Until then I’m here
With all due respect, I would recommend that you take action before. As noted by this other Pinsider, seek legal advice to see exactly whether Mirco is entitled to anything, and if so what you can do to mitigate damages before action is taken by the other party.
Your house insurance might have a "legal advice" clause for example (mine does), which will allow you to get at a minimum some basic guidance on this without shelling money. Or maybe your bank has something equivalent as part of your contract.
To me (I'm not a lawyer, but my mother was, and so is my syster - although in a different field than what we're discussing here), finding evidence of the fact that PF used in JJP pinballs are faulty is not relevant to your case. Mirco attacked your statements, and that's what you need to focus on, ie can any of the statement you made be marked as libel. Proving that there are hundreds of faulty playfield out there will not change anything if indeed your statement is deemed as libel. In particular, the statement on the contract between Mirco and JJP, which when read it like this is not backed by any source, as opposed to your technical analysis where you provided ample pictures and data.
But as the other pinsider stated, none of us are lawyer in this field (which law would apply as a matter of fact, Netherlands or Germany ?), so best to take preventive measures and seek councel.
Regards