This was a lot harder than I thought.

First attempt at 77 was horrible, could not clear the first boss.
Second attempt I cleared the first 2 bosses.
3rd attempt, changed spec for the 3rd boss, (Got Vampiric Blood) and cleared it.

(First boss = 2 deaths, I screwed up on the CD rotation)
(Second boss = 0 deaths, was easier than I thought)
(Third boss =.... a lot... But I figured out the CD rotation to keep my group alive)
(Fourth boss = Easier than the second boss, just stood there and made sure to use the right CD's at the right time.)