My friend owns a 740 1991. The outside left front and rear door handles are stiff or do not work at all. Often front door has to be opened from the inside.

He wants me to look at this but my experience is with 240s. When he comes over to my place I would like to be prepared with replacement parts if needed.

Do you bricksters have seen this problem?

Should I start with some kind of lubrication without removing the door padding inside? Or will it require new parts?

Thanks for any help.