Hi,
don“t know, if you alleady noticed this litle project of user SCRAT from A1k.org:
http://www.amigapcb.org/just klick on a pin ore pad and it shows your where the lanes are conected to and which value/name all the parts have

maybe very helpfull while repairing your Board....
actually Online A4000 and A1200 (beta) Mainboard. Others to follow....