I used Brookland Plumbing for the exact same problem and highly recommend them. They very carefull and test incrementally to limit damage and addiotnal repair. Only problem is tjhey are small and may not be able to get to you immedaitely but it’s worht a try. The have a straight A rating on Anglieslist.
1611 MONROE ST NE
WASHINGTON DC 20018 (Map it)