A B757-200 WAS DISPATCHED IN NON COMPLIANCE WITH THE #2 ENG ANTI-ICE VALVE IN THE CLOSED POS. MEL REQUIRED VALVE INOP OPEN FOR ICING CONDITIONS.

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THE FLT WAS SCHEDULED TO OPERATE ZZZZ-ZZZ1. MEL 30-21-1-1 WAS ACTIVE FOR THE R ENG ANTI-ICE VALVE IN THE CLOSED POS; WHICH REQUIRED NO OPS INTO ICING CONDITIONS. ICING CONDITIONS WERE EXPECTED AT THE DEST ARPT AND POSSIBLY ENRTE. I ADVISED OUR MAINT CTLRS THAT THE FLT COULD NOT OPERATE WITH THAT MEL. I WAS THEN ADVISED THAT A MECH HAD MECHANICALLY OPENED THE VALVE AND THE MEL HAD BEEN CHANGED TO MEL 30-21-1-2 FOR THE R ENG ANTI-ICE VALVE IN THE OPENED POS. THIS NEW MEL WOULD ALLOW THE FLT TO OPERATE. THE CTLR ADVISED ME THAT HIS COMPUTER SYS WAS NOT WORKING AND WAS NOT ABLE TO MAKE THE CHANGE ELECTRONICALLY. I AMENDED THE FLT RELEASE TO REFLECT THE NEW MEL 30-21-1-2 AND ADVISED THE FLT CREW. AT XA20Z; THE FLT CREW SENT AN ACARS MESSAGE ASKING ABOUT ICING CONDITIONS AT ZZZZ1. I CONFIRMED WITH THE CREW THAT THE CORRECT MEL 30-21-1-2 WAS IN THE LOG/DEFERRAL BOOK ON BOARD AND THAT THEY WERE ABLE TO OPERATE IN ICING CONDITION BECAUSE THE ANTI-ICE VALVE WAS MECHANICALLY OPENED. THE CREW AGREED AND WE DECIDED IT WAS SAFE TO CONTINUE TO ZZZZ1. UPON ARR ZZZZ1; THE CREW HAD A MECH CONFIRM THAT THE ANTI-ICE VALVE HAD BEEN OPENED. THE MECH AT RCTP ADVISED THE CREW THAT THE ANTI-ICE VALVE WAS ACTUALLY CLOSED.