Well..., yesterday I fired up the Jobo and ran a trial process, however once the machine had dumped the third solution the dreaded 'air diffuser faulty' message came up again; attempts to alter tension in the sprung arm that dumps process solutions did not result in a lack of error message unfortunately, whereas previously (2010 as it turns out) I had managed to work the mechanism free and continued processing. I may have another go this afternoon but I'm reluctant to start spending money on replacement parts when something else might stop working soon...

Tom