Few problems with my MM (fallen off switch, - wire desoldered)

[V0RT3X]

First I thought it was dead, it wouldn't turn on and one capacitator was a little puffed. Then I saw one of the switch wires fell off the esc and that it would't turn on. A little duck tapa and it was fixed for a while(lol).

Then I saw that the negative wire started to scuff off the board. The car also seems a little bit slower, could the wire be the problem, or is it just me?

No switch wires:



Negative wire falling off:




Capacitator: (might be because of a crash)




Now, do I have to use wire for the switch to work or can I just use solder to connect the 2 points together? I didn't have the switch before, I just connected the wires together)

What can I do about the negative wire?
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