A bit of an update here, I have stripped the EAS basically to its core bits and tried the alternate EAS ECU reassembled and no change. Well..... I looked at the big connector on the ECU which appeared to be clean, however, I thought it wouldn't hurt to get the old 1200 wet and dry out and rub it on the spades. Hmm, now leans to the other side and when in all heights the front sits much lower, a bit like a drag range rover
I did notice white dust when I sanded the spades so obviously there was some corrosion scale on them although 'twasn't visible. I think I will now get my inter dental brushes with a bit of contact cleaner and do the socket portion of the big connector, this obviously must have a similar layer on it. I don't know, corrosion after 25 years, who would have expected it
I had previously used contact cleaner on this plug but obviously the scale needed to be removed mechanically, hopefully when I retry to calibrate I may get some better results!