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There's nothing associated with that circuit that should draw any current to speak of, let alone enough to melt solder. Anyhow, check for solid continuity (zero ohms) from C11 to where it connects to the IF can, and to the 1 meg resistor (R11).
From the other side of C11, check for continuity to the top lug of the vol control.
There's gotta be an open on one side or the other of C11.
Doubtful, but maybe the cap itself has gone open(?)
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