Accessing the fuse box relays on a W140

[tower]

I need some help. After removing the 4 screws that cover the front of the fuse box, I still am unable to remove the cover to access the relays. Need some help here....is it suppose to slide, or are there more screws I haven't located yet? (95S420)

My front headlight washer/wipers aren't working. Before today the drivers was working (wiper) but the passengers not. Now I've got no power at all to the passenger side (lighting or headlight circuit) and need to get at the headlamp/waher relay to check it out.

All comments welcome and appreciated.

Ron