You have gotten some good advice.
I would just add that your 1991 car is now over 25 years old, and you might benefit from removing the interior door cards and luging the mechanism.
I did this on my '82 245 and things definitely run smoother and quicker.
Look for the YouTube by mercedessource.com on the subject; I found it very helpful. He describes the process and recommends lubricants, etc. The video is focused on Mercedes but the info is applicable to our volvos as well.
While you have the door cards off, lube the lock motors too; see Art's site for info. (Cleanflametrap)
-Hendoo
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