Hello Daniel,
cleaning the existent pads using flux and desolder braid should be easy. Than check if the yellow capacitors are well connected, solder if not. (C431 looks like desolderd.) The ripped pad is for pin 21 and regarding to the schematics not connected to anything. So this should be no problem. Solder a new IC and it should be ok (if no other problem exists).
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73 Ludwig
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