I received my SP8602 from this cheap shop (for €1.000,-) and no problemes to far.
I will check this info about serial numbers...
But now the most important thing:
The Picture is overwhelming

*) Very rare RBE - just using x4 CW, and will wait now for the bulp to reach about 100h and take a look if it really disappears completely as some other mentioned in the thread
*) DI - so far OK for me (using the reduced RGB 16-235 advice form here)
BUT
My only problem is the HDMI sync - it's really disastrous

*) first i upgraded the FW from 72 to 77 (hoping it will resolve this problem)
*) already tried a lot of compinations (Auto Source: off,Power-up Source: HDMI 1, Detect Film: on, Color Gamut: Auto, Aspect Ratio: Native)
Even on one and the same disc, without changing blu-rays, it looks like this:
Insert disc - no sync - you can already hear the main menu sound - still no picture - after some seconds the picture will pop up - select the main movie - no sync - you can hear the sound of the intro in the background - the end of the intro is displayed - the movie is starting - no sync for some seconds - and after a while you have picture and sound, so rewind to see also the first seconds of the movie - really annoying
If i swap blu-rays it's getting even worse - sometimes i have to switch the player of an on to get a sync.
My chain is:
Panasonic DMP-BDT110 - Pioneer VSX-920 - SP8602
using a high quality 7m (23ft) HDMI 1.4a cable
Any tips for this problem

PS: Standard noise reduction is set to 50 - i think i have to set it to 0 to disable this feature, right?