Headlights only work when Multi-function switch held back

Title says it all. Headlights went out about three months ago when my wife was driving at night. I replaced the multi-function switch and they worked normally since then. They just quit again and she had to hold the multi-function switch back to get home but that shines the brights into oncoming driver's eyes.

Was going to replace the headlight relay first and then the headlight switch if that did not solve the issue. However, cannot access the back of the left I/P fuse box where that relay lives. A video or detailed explanation of how to access the back side would be greatly appreciated.