Trunks are built and removed via LD 14, whether they are analog or digital. I assume this is a TIE trunk, since the card is E&M. Print a TNB of one of the trunk TN's to see what type it is, then access LD 14 and out it.

REQ: OUT
TYPE: TIE or other trunk type like COT, DID etc..
TN: TN of the trunk to be removed