Another solution is to place a small heat sink ontop of the Lisa chip, this is the main aga gfx custom chip and on the escom A1200's gets extremely hot. Causes graphic glitches and random guru's if hot for many hours of operation.
A small 20mm square heatsink, placed ontop of chip with some thermal compound, add 4 small drops of heatglue on each corner should fix the heatsink on nicely. Cost of around $2 from most electronic stores
You could also leave off the top silver RV shielding
This also helps to prevent over heating
Az
