I am reminded of getting on a 737 at Terminal 4 early on a very cold frosty morning for the first flight of the day. The aircraft was incredibly warm (APU running all night), the Captain's seat was fully reclined, with pillow, and the headset had Capital Gold tuned in. That was 'overnight maintenance'!
No,no, no Rainboe old chap, that was obviously a very concientous engineer checking that the standard Cruise setup was in full working order.
The FO's seat was no doubt in the fully upright position.
