Even as an amateur, I can tell that's totally wrong: you'are connecting '+' to '-' which definitely made a short circuit. That's why you will saw a flash (I made a similar mistake too - I reversed one capacitor).

The 'L' connector should only made for the '-' pin of C59 C60 C69 C70 and the '+' pin of C61, because these pins are connected on this side.

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http://img.vim-cn.com/fd/32ef3dc7a80e2ca70...8d21746a3fc.png 
And the 'L' wire should be better  facing the other hole/pin, because the capacitor pin is a little wider which leave spaces inner side. See my wiring below:

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If you mean the pad around '-' leg of C59 C60 C69 C70 and '+' leg of C61 on the down/back side, then it is not a big issue. If you see carefully on my last photo, the pads are missing too (thanks for my bad soldering skill)
For me, I just put lots solder on it (but DO NOT connect it to the copper surface around), and make a small globe which can make the capacitor more steady. I'm going to put glues on the capacitor to make it more steady.
I can't tell. But you may want to check the fuse first. Then check these capacitors using a multimeter.
My mistake caused 3-5 fuses blown, but the capacitor survived (Nichicon capacitors seems so damn good).
My mistake is I soldered a new capacitor on the left amplifier board - the big one, the 1000μF one, but it's reversed. But after several fuses blown, this capacitor is still working.