Defective L2 cache -- next steps

[Logan Rathbone]

After months of mysterious ICEs (internal compiler errors) with GCC, I've finally narrowed down that there's a problem with my computer's L2 cache.  It is a 256 KB cache.

My question is, what do I do, now that I've detected that there's a problem in my L2 cache which has been causing these problems?  Do I need to replace the part, or is there some kind of program I can run that can test the cache and fix errors?

Thanks, I appreciate any help! 
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