MAINT CONTACTED FLT ENRTE SEA RETURN TO MEM ACCOUNT MAINT NOT COMPLETED ON ACFT.

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WHILE IN RESERVE STATUS CALLED IN FOR FLT MEM TO SEA. DURING PREFLT NOTED IN ACFT LOGBOOK THAT AUTOPLT SIDE 'A' DOWN FOR CAT II; SIDE 'B' CAT II UP (YELLOW MAINT TAG IN FRONT OF LOGBOOK AND ON AUTOPLT CTL PANEL AS EXPECTED/REQUIRED). ALSO NOTED THAT THERE HAD BEEN A PREVIOUS GRIPE OF EXCITATION FAULT ON ELECTRICAL SYS AND ON THE LNDG GEAR DOORS/TAILSKID. ALL WERE PROPERLY SIGNED OFF BY MAINT. I BRIEFED THE CAPT ON THESE ITEMS WHEN HE CAME ABOARD. HE THEN REVIEWED THE LOGBOOK AS WELL. THERE WERE SOME 'DO NOT RESET CIRCUIT BREAKER' TAGS IN COCKPIT; BUT ALL CIRCUIT BREAKERS WERE ALREADY RESET. APU WAS RUNNING AND ALL LOOKED AS IT SHOULD FOR FLT. I ASKED A MAINT MAN OUTSIDE ACFT IF CIRCUIT BREAKER TAGS HAD BEEN FOR AUTOPLT GRIPE (WHICH WAS NOW SIGNED OFF). MAN STATED; 'ACFT READY TO GO' OR WORDS TO THAT EFFECT; AND NODDED 'YES.' APPROX 45 TO 60 MINS INTO FLT; WE RECEIVED AN ARINC CALL WITH PATCH FROM MEM MAINT REPRESENTATIVE ADVISING THAT ACFT HAD AN OPEN MAINT ITEM; AND THAT WE WERE TO RETURN TO MEM FOR AN ACFT SWAP. IN REVIEWING ALL THE DISCREPANCIES IN THE ACFT LOGBOOK A COUPLE OF TIMES; I FOUND A WHITE MAINT FORM UNDER HARD YELLOW SEPARATOR THAT HAD A SIGN-OFF; BUT OBVIOUSLY WAS NOT CLOSED. BOTTOM LINE: 2 MISTAKES -- 1) I KNOW TO CHK UNDER YELLOW PLASTIC; BUT OBVIOUSLY DID NOT THIS TIME. 2) ACFT SHOULD NOT HAVE BEEN RELEASED FOR FLT.