What are points of failure along battery path?
I have a 2012 15" rMBP that had a liquid spill. It is currently experiencing keyboard and battery issues, but it does power up and run properly, particularly if using external keyboard/mouse/display. The battery issue is that the machine doesn't recognize it. The battery icon shows an 'X' through it, and the MagSafe connector only glows amber.
Does anyone know what the circuit for charging the battery "looks" like? Does it share any circuits, traces, or connectors w/ the keyboard along the way? I'd like to check each piece (presumably starting w/ the MagSafe DC-in board) for residue or failure and see if I can get it recognized and charging again.