ehhh, help!! md-2 with with lost wire

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I was in the middle of putting in a diode through a feedback loop and when I went to plug it in it was dead. apperently the reason for this is a wire broke loose, and I can't find where it was broken off... It's blue and comes from the circled '8' in front of the power source. the power supply is soldered on in 5 places, which is something I'm unfamilliar with so I have no clue. the led lights up with a battery but not a power jack. soooo.... can anyone crack open their md2 and help me out?? I just need to know where the wire goes. the blue wire!