My sunroof, as of yesterday, won't close properly. The corner (closest to rear passenger side) won't "go up" all the way to meet the roof properly. I can hear air coming through when I drive. Is there an easy fix? or How much does an excorcist cost?

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Nello Tare

1982 300D (266,001 mi.) looking and running great

Previously owned:
1976 450 SLC
1983 300D
1976 300D
also
1982 Jaguar XJ6 (loved, but gone)