That's a very good tip. Though it does require constructing an extra long cable between the logic board and analogue board. It also doesn't help identify more than one bad chip at a time. However, I imagine that the error code will change when you find on or more of the bad ones, eventually identifying all the bad chips.

This board pictured is typical of the error codes I've seen which almost always specify more than one chip. In this case, I'll bet both of those chips had both failed from the time it was last used to the time he fired it up again.