Can be frustrating and a little mysterious if you have not done it before
Any interior door maintenance almost always requires the removal of the door panel. If you don't know how to do it it can drive you crazy. Many owners resort to force to get the panel off the door. This leads to broken clips and plastic hooks. To make it more difficult, different chassis have different procedures. Some pull straight off. Others have to be lifted upward. All have "hidden" fasteners that you must know how to get to.
Problem & Solution
Common among these chassis:
W114
W115
W123
W124
W126
W201
W210
Kent has written manuals and produced some videos that will walk you through the process of getting your panel on and off with ease and without damaging it. Some of the manuals also discuss typical repairs and service once you successfully get the door panel off the door.