Hi, Xel,
I have a Perzina GP129 that I purchased in January of 2007 , and had a similar issue when it was new, which I reported in an earlier thread:
Pianos from China..actual user experience have one small problem, and the dealer is working with me to solve it. Several keys squeak (tiny baby-mouse-like squeaks that I can hear but a listener a few feet away cannot, which happen on only a few keys). The dealer has sent out two different techs, and each time they got rid of the squeaks (first tech cleaned the keybed carefully, the second one lubricated all 88 keys), but the squeaks came back. Last time, the original squeaking keys stopped squeaking, but now several others do. They will be sending out another tech to work on it later this month. I'll report on success in getting rid of the squeaks.
. . .
As promised, I now report the outcome: the squeaks are well and truly gone. The thing that fixed it was lubricating the key bushing for the balance rail guide pin felts. (The theory was it might be dampers, but the sqeaking occurred before the damper was even engaged.)
After watching the work & talking to people about it, I think it's pretty clear that this qualifies as a normal new-piano problem, not some problem with the quality of this Chinese-made piano (a Perzina GP 129). According to the tech, they wash all of the lanolin out of the wool in new pianos (to prevent moth damage) and if felts squeak, they need lubrication (and there seem to be a lot of places where this can happen.)
So, now all is well, my piano is perfect, and I love it even more. Not trying to influence sales one way or another, but for my needs this piano was just the ticket. .
Perhaps this will help you talking to the dealer's tech, and you can get the problem fixed without three visits (if it's the same problem),
Good luck!
Margaret
.