Hi all A couple of DSLs are available to me. 1999 and 2002. My friend had a DSL100 a while back (can't remember the year) and he had the dreaded Bias Drift and heat issue. He ended up getting the latest revision board from Marshall and swapping it out (didn't stop the audible Power TX hum though). Is it the case that the later the model, the later the board and therefore the least issues? Seems they went through 5 board iterations? With the last one being the least problematic I guess?