>Try all of these typical things and see if it helps.
-pu r * n
-pu all n (until everything is purged)
audit
recover
(repeat process until everything is purged and no audit errors)
>If that doesn't help, in each environment (mspace, pspace, etc.):
Erase All
Undo
>then...
Save, Close, Reopen
>then....
-pu r * n
-pu all (untill everything is purged)
audit
recover
You can also try saving to a different dwg version then back, if you can, which may rewrite parts of the file that may be corrupted.
If all else fails... rebuild the file from a new one.
Good luck!