Standing at the pulpit, Nancy Baptiste led her congregation in reciting not amens or hymns, but the number most public housing tenants have committed to memory: 7-1-8-7-0-7-7-7-7-1 That’s the phone number New York City Housing Authority, or NYCHA, tenants call when something needs to be fixed. Too often, Baptiste said, no one shows up, the wrong work gets done, or the maintenance crew makes the problem worse.