I did call support to check on this and am waiting on feedback but figured I'd try here too to see if anyone else has done this or knows off the top of their head if it would work.
It *appears* that you can simply replace the controller in an 1840i with the controller from an 1840f and it would work.
Has anyone tried this?
Google was no help, sadly. I didn't even find any luck with tracking down a used controller. I found that odd. Perhaps I need the correct part number? Most I've seen all start with VRxxxxxxx but one doc from Promise says its supposed ot be F29R14F20000000. That does not match up. It only gets 3 hits in Google. Anyone know the correct part number?