Xenon burner exchange S80 II

Dear people, I recently received both Xeneon burners and I would like to exchange the second one myself (the first one was exchanged for expensive money in the workshop). First of all I wanted to check which model was now installed by the workshop to have the same color temperature. Now my problem comes: on Youtube there are wonderful instructions on how to take out the headlights and change the pears. Easy for children, one would like to think – but unfortunately this can be seen imm It’s easier than it is. I just can’t get the plug down for the power supply. According to the operating instructions, you have to push your thumb in the top and pull it at the same time. But with my S80 there’s just nothing going on! The part must have been stuck somehow over the years. Has anyone already had the problem and could solve it? I don’t dare spray WD-40 on it, because it might also cause damage. Greetings, Gryphon