Yes, I know - I had the same sentiment as you concerning the 482 and would have been more convinced if it had been the 481. But the order of events is too coincidental. Keep in mind, though, that I also cleared out anything which looked suspect between all leads of the 206, 482, 481, and AM386DX. I did not swap the cache around between "cleaning". That is, motherboard not working with L2, symptoms are repeatable from day 1 to day 2; while touching nothing else, I "cleaned" the SMD IC's; powered back up, no L2 errors.
I'm not saying with absolute certainty that I've isolated the problem, but unless the symptoms reemerge, I'll be following the advice of this popular adage "if it ain't broke, don't fix it". Of course, I will continue to test the system, move it around, press here and there, etc. I intend to test an SXL2-50 at 55 MHz, a DRx2-66, and an IBM Blue Lightning DLC3 at 100 and 110 MHz.