My F150 headlights are not working on high or low beam mode; only in daytime running lights mode. With the headlight switch on, the MFS (turn signal lever) will turn on high beams when pulled back for momentary actuation, but will not turn on high beams when pushed forward, nor do the low beams work with the MFS in the neutral position. Could this be a fuse issue or a worn out MFS. If MFS, is it tricky to replace? Thanks for any input. Love my truck otherwise!!