AN A320 RETURNED AFTER TKOF FOR EPR MODE AND A/THR OFF FAULTS. THE EPR MODE FAULT MEL USED TO RELEASE THE ACFT WAS INAPPROPRIATE.

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FIRST LEG INVOLVED A RETURN TO ZZZ DUE TO NUMEROUS ECAM'S IN SEQUENCE WITH A RESULTING 'ENG 1 -- EPR MODE FAULT' AND AN 'AUTOFLT -- A/THR OFF' ECAM BEING DISPLAYED. BECAUSE OF TSTMS AS WELL AS NUMEROUS DUAL FMGC FAILURES IN THE MAINT HISTORY; A RETURN TO ZZZ WAS EXECUTED. THE FO MADE THE WRITE-UPS USING THE MAINT CODE MANUAL AND RELAYED THE APPROPRIATE ECAM TITLES IN THE LOG. AFTER MAINT DEFERRALS; THE FLT AGAIN DEPARTED ZZZ. AGAIN; PASSING FL220; THE SAME ECAM AROSE. I CONTACTED MAINT AND RELAYED THIS INFO. SINCE WE HAD BEEN DISPATCHED WITH A DEFERRAL AND SINCE THE MEL HAD ESSENTIALLY ACCOMPLISHED WHAT THE ECAM REQUIRED; NO ACTION WAS REQUIRED BY THE CREW. HOWEVER; UPON DISCUSSION WITH MAINT; HE WAS UNAWARE THAT WITHIN THE ECAM STEPS UNDER THE ECAM 'ENG 1 -- EPR MODE FAULT' WAS AN ACTION TO TAKE REGARDING AN 'N1 DEGRADED MODE.' WITH THIS INFO; AND ASSUMING THAT SAME STEP WAS REQUIRED UNDER THE ECAM THAT OCCURRED ON THE FIRST LEG OF THE TRIP; A DEFERRAL WOULD NOT HAVE BEEN AUTH. IF THAT IS SO; THE DEFERRAL UNDER WHICH WE OPERATED THE SECOND LEG WAS INVALID; AND THEREFORE; A POTENTIAL IMPROPER MAINT DISPATCH MAY HAVE RESULTED.