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Simon,

Before you throw money at a new six pack, build yourself the classic air leak isolation setup as outlined many times on the forum. Install it BETWEEN the six pack and the offending corner. It will install where the air line for that corner exits the six pack. Easy with your pit.

Now isolate the six pack from the offending corner. If the corner still sags the problem is NOT the six pack.

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Jeff,

The control box for the HWH will be in the outside compartment below the drivers feet. Big aluminum box with a gazillion wires going in and out.

Thanks Richard! Will have to get back in there and take a look.