I'm sorry about that, but thanks for the bug report!
I just found out that the bridge changes back to unrepaired state if you click once again on it, just after repairing....
I updated the game - so now this can't happen anymore ;-)
hacking is done by the following steps:
1st login (user:root, pass:cursed)
2nd type "vi gshadow" --> change the line from $xxxxx to $00000 (for the group net)
press q or enter
3rd type "join net default" --> you should join the group net
4th type "vi interfaces" --> change the line from "power on" to "power off"
press q or enter
you did it...