If switching the reels around still shows the 42 error, you may have a bad reel 2 driver. Like it was suggested, make sure there's nothing rubbing against the reels as they spin. If you are proficient with soldering you can remove the reel 4 driver and switch it with the reel 2 driver as the there is no reel 4 on your machine. If you have access to a spare MPU board, you can try that before you start removing components about just to make sure. If you don't have a spare mpu board, you should get a spare as the supplies for these are drying up.