OP, I have no idea how handy you are, but a Google search on "solar attic fan replacement parts" yielded several manufacturers and several part vendors, some local. If you know or can find the size (diameter) of the tube, I saw replacement tops ($390). If you are not handy, a local handyman may be able to help, I am sorry, but I do not do roof work, even my own.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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