Irwin 40 Centerboard

[drbradclark]

I have a 1982 Irwin 40 Citation with a Centerboard. The boat is now in drydock for the winter. Late in the season we discovered that the centerboard was stuck in the up position. It looks to have a bit of rust and other gunk holding it up. I plan to have the marina block the boat up high in the spring so i can work on getting this thing unstuck.
My question is, does anyone have any information on what normal maintenence is required on this centerboard? I used to have a Catalina 22 with a swingkeel and each year the keel pin bolts needed to be changed and the pin checked. I know nothing about the mechanism of the centerboard in this Irwin or the normal maintenence for it. Any help would be greatly appreciated.