How about just using a different method to figure out which statment is causing the problem? I would say it is simpler then removing (or deactivating, as you suggest) actions.
simply add a new Copy action w/ @null input and @null output, with a tcl call to just echo out something… like: puts “MADE IT HERE”.
put this statement somewhere in the Xlate… like halfway down, and run through the testing tool. If the echo displays before the error, the problem is farther down, otherwise it is higher up. Just move the echo statement accordingly to narrow down to exactly where.