Allan is correct regarding 807. She was the only one never painted in AN corporate colours, and also the only one to never receive the marker light and shunt step mods (checker plate steps cut out and replaced with safer expanded mesh steps). The MU plugs were also removed at the same time whilst these mods were being done (all except 807 I think).
From what I recall 807 ended her days in the pale yellow scheme with black ANR logos on each hood. Unfortunately I was giving her an "A" service at Mile End Diesel Depot (circa 1988-89, can't recall exactly!) and pointed out to my boss that the engine block was in need of attention. The top half of the block had come slightly loose and was bouncing against the sump section when revved up, resulting in very serious oil leaks. My boss went back into the office to make a call and come back to say shut her down and box her up. She was to be stored and subsequently scrapped. Thus becoming the first 800 withdrawn from service.
Later at Islington a group of NRM members were given permission to cut off the handrails (complete with marker lights) and strip other parts for later use on another 800 to be preserved, which eventually became 801.
Of course 800 became 810 when the new AN computer system couldn't handle the same number in the "class" and "number" fields. I also vaguely recall 806 and 809 swapping numbers at Islington when I was an apprentice in the Erecting Shop, which would have been about 1985. I know one of them had thrown a rod and was having major surgery to her block, but as to why they had to change numbers, I'm not sure. Maybe someone else can help out here?
The cab side numbers are also worth mentioning too. All the locos were fitted with chromed brass numbers when built. This remained the same until the AN period. Some locos kept their chromed numbers (807 definitely did), some had their metal numbers painted AN yellow, some lost their metal numbers and had the number painted directly on the cab sides in AN corporate font. I think it was 802 had her metal numbers sand blasted to remove the chrome and ran with just plain brass finish, never polished.