I did say "a few were Pal" models. These could have been bought second hand, been opened voiding their warranty from Sony or any number of other reasons why they can't claim their warranty. That's why we get them in for repair as they can't send it to Sony. Hope that solves your puzzle.
Sony does indeed do in house repairs but that doesn't really affect me knowing the laser is dead. I can still work that out, i don't get your point??. The lasers are failing from something and a new one fitted is making them work just fine.
As for calling a fault. Well there is a fault with them(the units i have) they dont work(laser) a new part fixes them. That's the facts i have for you.
I only throw this out as a good proportion of the customers mentioned it was after an update. I was looking for any theories or experiences anyone may have along these lines. Im not saying an update is causing it and did mention it could have been coincidence.
Cheers though.