Who do I contact at IRS for a 1041 refund?

I saw my check was in the mail and at the post office 3 weeks ago but I never received it.  Who do I contact regarding 1041 Trust refunds and how do I get it reissued?  I don't believe I can use the 1040 phone number.  I tried the "where's my refund" page but it is only for 1040 refunds.  TIA!