Thanks, it is unfortunate that the latest firmware did not fix the said bug. The problem is with the hardware component itself (LOM). As LOM is integrated on the System Board, Sun will have to replace the SB itself. Ofcourse, they will drag this to max. extent to suffer the customer, anyway.
We can try few more things, on how LOM firmware should react to the alerts. Can you make sure you have "auto-boot-on-error?" set to "false" ? if not you can follow below
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ok> setenv auto-boot-on-error? false
ok> reset-all
Page 39 ==> Disabling AutoSystem Recovery
http://dlc.sun.com/pdf/819-2549-12/819-2549-12.pdf
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We are just trying to change the behaviour of OBP on certain failure occations. But in your case, it may not work as "Chassis Covered Removed" is a serious message for OBP to shutdown himself immediatly...but worth a try.
Ahh..just got a thought. If you have time and luxury, please make sure there is no material stuck (or some thing) at the the chassis cover interlock switch (intrusion switch). Not having this switch with proper contact after closing the top cover, might also lead to this "Chassis Cover removed" senarios. Good luck.