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Certainly you can update the module yourself and hopefully offer your fixes to the community.
If the module has an active developer, submit your fixes to their website or at dev.xoops.org. I am sure many mod devs will offer 2.3 updates in the near future.
If the module appears inactive, post your fixes in this forum. If your interested, there is a XOOPS Module Team that tests and update the old modules that could use your talents.