I don't think so. The helo malfunction may have been due to FOD. Rocks and sand flying about sucked up in the engine..Or perhaps something hit a rotorblade. I'm sure no LZ was completely cleared before the landing. My shipmates the US Navy SEALS destroyed the helo before they left the scene.
Bravo Zulu a job well done.
Yeah the more you read about all sorts of special operations missions, the more you realize that Murphy's law really is correct. You practically have to expect mechanical failure or something at the worst possible moment. The Iran hostage rescue mission in 1979 failed because of various mechanical and "Random" problems. In the "Black Hawk Down" incident the original US casualty that set in motion a chain of failures was caused by a guy falling while repelling from the helicopter. I could go on and on with examples of covert operations that suffered from problems not related to enemy fire. I'd imagine that in this case, the heli crashed on the way out, otherwise they probably would have scrubbed/modified the mission. I have a nagging suspicion too that maybe the helicopter was shot down by Pakistani Army units that were in Abbotabad.
EDIT: The latest news says that Obama watched the operation go down on live video and that that Pakistanis scrambled jets as the SEALs were egressing.