ElectroVoice ETX-18SP (powered Subwoofer) damaged after lightning strike

[pfl]

Hello Everyone.
This powerful amplified subwoofer doesn't make any sound after lightning striked near the house were it was plugged in.
It consists in :

• a power board were the full H bridge class D amplifier and main power rails are located
• a preamp board (ref. F.01U.299.771) receiving 2 symetrical inputs(IN1, IN2), a digital chain (A-D converter -> Digital Signal Processor -> D-A converter) and a micro controler in charge (at least) of the human interface (lcd display and 1 rotating button)

Power rails are ok.
human interface is working fine
Input levels are displayed on the screen whenever a signal is applied on either inputs

But ...

1. a red led is blinking (every seconde) what does it means (nothing good i guess)
2. The 2 analog Inputs on the A-D converter (pcm1802) seem wrong : one is somehow IN1+ IN2 in common mode the other the same at very low level and noisy ; what are these inputs supposed to be ?
3. Is the entire program for the DSP (DSP5674) stored in the external SPI eeprom or is there some code stored in DSP rom ?
4. there's a relay (coil unactivated) : what is its purpose ?

If someone has got answers or even better owns the service manual and is ready to share it it would be christmas time (again)

Thanks for your time

pierre-françois