RX50 Dis/assembly..

I'm really embarrassed, but guess what? I took apart my RX50 (cleaning/servicing..) but didn't bother to document where all the jumpers/headers go.. Well, when I try to put it back together, there's just 1 3-way header left which has THREE posibilities (board has 3 instances of 3-way male headers), and I don't know which one to put it to. The said 3-wire (red, blue, yellow) header originates from the optical slotted switch which detects (I think) the end of the tracks. It will terminate to one of the 3-way male headers at the SEEK/INTERFACE backboard (which is perpendicular to the main metal chassis. Here's some ASCII art of SIDE1 of the SEEK/INTERFACE backboard with all the headers: A B C V V V +------------------------------------------------+ | ++++ +++++ +++ +++ +++ | | | | | | ++++++ | | ++++++ | | | | | | | | | | + ++++ | | + ++++ | | + +------------------+ | | | |+ +-----+ | | | 2x17 Female BERG |+ +++++ |POWER| | +------------------------------------------------+ So the question is, does the slotted switch cable terminate at headers A, B, or C? /wai-sun