Analogue-sequencer

Hello,
My unit showed a blank screen last time I switched it on. It was the old display so I installed the new blue lcd but it was the same: the screen lights up but shows nothing.
I tried the "P3 resurection" tutorial I found here but it didn't work so I tried a new firmware installation (with the blank screen) pressing func+page at start up then f3 and send the "p3-bootloader-v3.3-AT" sysex..my bad..since then there's not even a single led lighting up except the 8 vertical leds at the right of the unit when I power the P3 on.
My biggest problem is I asked a professional in order to get it serviced but being he doesn't have any technical documentation about the P3 he said he couldn't do it.
I wondered if such technical documentation was available or maybe someone could tell me where I could get my P3 repaired.

Thanks