Clarification on car amp power

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Headsh0t

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hi there :)

So i got this amp (broken) after a friend was to either too lazy or just trying to show off. Anyway long story shorted out, I would like to get some advise from the pro's on this. Namely, in the picture there are a few arrows.

Am i correct in saying that the top two are are the main output rails to the transistors as they have directs tracks to the 'fets. And
Why would calibra use a 470 at c311 (small arrow) if it is connected together on the other side with c310 giving 1470uF on the NEG but only 1000uF on the POS. am i missing something?
c308 (Last arrow) is the IN cap Before Tx.
 

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