How to rejoin a UCS DC as Windows AD member server?

We have an UCS DC master as member server of a Windows AD domain (using UCS AD connector).
Everything worked well until _somebody_on the Windows side changed (=resetted) the computer account of the UCS server in AD so that UCS server can’t access the AD any more with its account.

As the new credentials on AD side are not known we thought that removing the UCS server from AD (in windows) and rejoining the UCS as AD member might be a solution.

So our question is: Is there a way to rejoin the existing UCS DC master controller as AD member computer again?