I don't own a Pearson, but just finishing up restoring my seahood on a CS36T. If its a cored panel like most, its a pretty simple process to remove the core, put a new core in, and relaminate it. Mine had been "repaired" by a previous owner, which actually made repairing it correctly more difficult and had caused the panel to take on a new wavy shape - It also really crazed the top surface. But in the end after spending this last weekend building a cradle to get the shape back, sanding and fiberglassing, I am ready to lay down the gelcoat tonight (you wont even have to re-gelcoat if the top isn't crazed). Worst part of the whole process is actually removing/grinding the parts that aren't rotted - rotted core is a breeze to remove with a fein, or similar type tool.
BTW - in the past I have always used the standard cores for these things (balsa, foam, plywood), but I tried coremat/BaltekMat this time and I really liked it -Weighs a bit more, but goes down just like mat, can't rot, wont delaminate, and probably adds a bit of strength. Just a thought.
Its an easy and fun job - If my assumptions about how yours is built is correct.