Place a fence around complete file.Keyin aa=360. rotate fence. this will rewrite entire file.
or Use (sub folder under microstation programs)
Edg
open 'filename.dgn'
Set search /all
repair all (use edg help to see the syntax to use for repair.)
you can also set the display on
Set display /full
EOF (end of file)
this will let you watch the repaired elements
Make sure to close the file.