Two Phillips head screws at base of pillar trim and then pull trim out at bottom and then down. Is there specific lube points that you need to hit? My '85 300D has the same problem once in awhile. After pulling on the belt for some time it will release but it can be a pain in the rear. I noticed that it seems to take me longer to get "unstuck" each time, so I want to try to nip it in the bud before it gets really "stuck".

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Frank
84 500SEL EURO 101K ( JUST LIKE MY 1ST WIFE. GLAD TO GET RID OF HER! )
85 300D 310K (sold)
90 350SDL 184K sold
83 300D 118K (sold)
88 300E 153k (sold)
93 400E 105K (sold)