This was in January this year. Another post also provided pics and an explanation of the wiring layout clearly showing split channels.
I can only assume the 282 layout is the same (with the exception of the Buffer stage) as Mark said so as below.
“I owe everyone an apology as I said earlier in this thread that the 82 wasn’t wired L and R between the two power supplies, well on looking in my notes and not relying on my memory I can clear things up a little. The truth is that it is and it isn’t. Let me explain: With one or two hicaps the gain stage is split L+R between the power supplies with one rail from each hicap powering the gain stage and other rail doing everything else - which is most of the rest of the circuitry for that channel. Except the tape buffers are swapped on the 82, but not the 282. This is due to the board layout and mute circuit location and means that the mute will not lift unless both supplies or a link plug are fitted. That’ll teach me not to write about them without my notes in front of me.”