AN MD80 CAPT REPORTS CONTRACT MAINTENANCE ACTION ON HIS ACFT THAT TAPED AN OXYGEN DOOR CLOSED. FLT ATTENDANT AND FO DID NOT BRIEF CAPT ON MAINT ACTIONS.

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PRIOR TO MY ARR AT THE PLANE; AT THE REQUEST OF ONE OF THE FLT ATTENDANTS; THE FO CALLED CONTRACT MAINT TO LOOK AT A ROUGH PIECE OF METAL THAT WAS IN THE AREA OF THE AFT GALLEY JUMP SEAT. DURING BOARDING THE MECH CAME UP AND SAID HE COVERED THE PIECE OF METAL WITH A PIECE OF TAPE AND THAT IT REALLY WASN'T A PROB. AS I DIDN'T EVEN KNOW HE WAS ON THE PLANE; I INQUIRED FURTHER AND WAS SATISFIED THAT IT WASN'T AN AIRWORTHY ITEM; MORE DUE TO NORMAL WEAR AND TEAR. I ASKED IF HE NEEDED IT IN THE MAINT LOG AND HE REPLIED NO. AN HR INTO THE FLT THE #2 FLT ATTENDANT CALLED THE COCKPIT AND SAID THAT THE DOOR TO THE GALLEY JUMP SEAT OXYGEN CONTAINER; THAT THE MECH HAD TAPED; HAD POPPED OPEN. ONCE AGAIN I WAS TOTALLY SURPRISED THAT THE DOOR TO HER OXYGEN MASK HAD BEEN TAPED SHUT. THIS DOOR IS SPRING LOADED; ACTUATED WITH THE PAX OXYGEN SYS AND HAS A LATCH SIMILAR TO THE ONES IN THE PSU'S. I FOUND OUT THAT WHILE THE MECH WAS PUTTING TAPE OVER THE PIECE OF METAL HE ALSO DECIDED TO TAPE THE OXYGEN DOOR CLOSED. ADDITIONALLY; DESPITE THE NOTE IN THE FLT ATTENDANT MANUAL REQUIRING CAPT NOTIFICATION; THE FLT ATTENDANT ELECTED NOT TO. NEITHER DID THE MECH MENTION THAT HE DID ANYTHING IN THE PLANE OTHER THAN COVER A PIECE OF METAL NOR DID HE CALL MAINT CTL TO FIND THE PROPER WAY OF RESETTING THE LATCH. HAD HE TOLD ME I COULD HAVE SHOWED HIM. LASTLY; THE FO HAD MINIMAL KNOWLEDGE; YET ALSO ELECTED NOT TO ADEQUATELY BRIEF ME. BOTTOM LINE; THE AFT GALLEY FLT ATTENDANT JUMP SEAT WAS IN AN UNAIRWORTHY CONDITION THANKS TO AN UNAPPROVED/UNAUTH REPAIR PERFORMED BY CONTRACT MAINT. ALTHOUGH THE FO HAS OVER 11000 HRS IN THE MD80 AND IS SENIOR TO ME; I BRIEFED HIM THAT HE WAS NOT THE CAPT AND SHOULD HAVE ADEQUATELY BRIEFED ME. LASTLY I REMINDED THE FLT ATTENDANTS THAT THERE IS A REASON WHY THERE ARE ITEMS THAT REQUIRE THE CAPT'S NOTIFICATION.