I just wrote a few drill exercises to practice. I practice these kind of exercises when I have to get my lead chops back.
But I agree with all other guys. Being a prof. leadplayer doing something like 160 gigs a year I rather play other stuff (mostly classical) to keep the balance.
I have more (lead) exercises on my website to keep you busy for some time . I can recommend the Stamp exercises for lyrical playing in the upper register. Also "Maria" is nice to practice. I wrote it out in several keys. It's in line with whta Maynard says in this article:
MaynardFerguson.com