ACR MLG HAD TO SHUT DOWN AN ENG INFLT AND RETURN LAND AFTER REPEATED INCIDENTS OF HIGH OIL TEMP.

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DEPARTED MSY FOR IAH. DURING CLBOUT OIL TEMPS BOTH CLBED HIGH. REACHING CRUISE #2 OIL TEMP WENT INTO YELLOW ARC. IT STAYED THERE FOR ABOUT 1 MIN THEN CAME BACK INTO THE GREEN. DURING DSCNT; BOTH OIL TEMPS WENT INTO YELLOW. WE WERE ABLE TO CTL THE #1 BY ADJUSTING THE THROTTLE. WE WERE UNABLE TO CTL #2 AND IT STAYED IN THE YELLOW ARC FOR ANOTHER 7 MINS. WROTE UP THE ACFT IN IAH. MECHS CHANGED THE TEMP BULBS ON EACH ENG AND SAID THAT THAT SHOULD ALLEVIATE THE PROBLEM. I EXPRESSED SOME DOUBT ABOUT THEIR SOLUTION BUT WAS ASSURED THAT THE PROBLEM SHOULD BE FIXED. WE TOOK OFF FROM IAH BOUND FOR CRP WHEN THE #2 STEADILY CLBED TOWARD THE YELLOW ARC AGAIN. AT ABOUT 18000 FT; WE ELECTED TO RETURN TO IAH AS THE TEMP HAD GONE INTO THE YELLOW ARC. TIMED FOR ANOTHER 7 MINS (15 CUMULATIVE WITH PREVIOUS FLT); SHUT DOWN #2 ENG; DECLARED EMER; ACCOMPLISHED APPROPRIATE CHKLISTS AND LANDED WITHOUT INCIDENT. AFTER PARKING; FORGOT TO PULL CVR CIRCUIT BREAKER. FILLED OUT CAPT'S IRREGULARITY RPT. SUPPLEMENTAL INFO FROM ACN 185243: WE HAD THE SAME ACFT FOR 5 LEGS. ON ALL THE LEGS THE #2 ENG RAN INCREASINGLY HOTTER (OIL TEMP). ENRTE FROM IAH-MSY; DURING THE DSCNT WE HAD TO KEEP 1500 POUNDS OF FUEL FLOW ON THE ENG TO KEEP FROM RUNNING THE OIL TEMP IN THE YELLOW BAND. WE CALLED THE MAINT SUPVR TO EXPLAIN WHAT HAD BEEN HAPPENING. HE STATED THAT BOTH THE BULBS WERE PROBABLY BAD AND HE ASSURED US THAT WAS THE PROBLEM. ALSO; IF IT DID HAPPEN AGAIN THAT THE PLANE WOULD BE GNDED.