Quad 34?

I just picked up a quad 34 preamp in fairly tidy condition for £20. The seller says it needs a new IC but isn't sure which one. I haven't passed any signal through it yet but it seems to switch between inputs fine, however it'll only select filter two, pressing F1 switches the F2 led off but doesn't illuminate the F1 led. Pressing the slope button makes the LED glow very dim so I'm assuming there is a fault with the gate IC (IC11 MCP14001BCP), has anyone else experienced this?

All the electrolytitics look good so I doubt they are causing any issues.

Also, does anyone know if it will partner okay with a Linn LK100?

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Quad 34?