Tried looking for a service manual? Generally thre are a number of sites that offer PDFs for "sale" for $10-20. I highly doubt they are authorised to sell them so but I've bought a couple with no issue so far.

That LED blink code is definitely worth deciphering.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)