Corrupt Logical Log

A couple of days ago I experienced the unfortunate problem of the a logical log that contained the current checkpoint had become corrupt. The engine had aborted while holding a latch and shut itself down. When restarting the initialization process failed as it couldn't find the last checkpoint record to roll forward from and thus shutdown again. We had to restore from backup *but* is there away to amend the current logical log number so that it would have looked at a previous one. I didn't get much response from our support VAR. Any body got any bright ideas... David