No Cell Power!

I found a video on YouTube and checked each step. Until it told me my rectifiers needed replaced. So installed new rectifiers. Still no power took my T-15 cell to a buddys house, and it turned right on. I did find a burnt solder on back of board. It was behind a relay. I was wondering how hard it would be to replace? Any help would be appreciated. Pic is of relay that has burnt spot behind it.image.jpg
 
Most of the time you just need to refloat the solder so it makes a better connection with the trace. Have you ever soldered before?
 
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