Why would you think it's a PPRuNer?
High Alt,
if you have some ideas on who may have done it, hopefully you've conveyed that to the authorities.
In both this and the bike incident, how do you know it was perpetrated by disgruntled employees? (From this and the previous thread, you are implying this).
Before you flame me, I described to you on that thread how you might fix your bike and listed threads on where you might find cheaper parts.
I've come out after work a couple of times to find my bike on its side. I could blame it on a malicious act by a colleague (doubt it very much as I believe the culture in my Company is not like that). I reckon it was done by some opportunistic scumbag walking through the public carpark p!ssed off because I had something they did not.
Think about it...............