If you want to kill the Encounter "Patchwerk in Naxxramas" there's an easy trick how you can do it.
Attachment 120
U need:
1 Full T2 Warrior
5 Healer
Others should be Dmg-Dealer
1. Clear the trash-mobs threw the encounter.
(Don't use the Bonus yet!!)
2. Duel your maintank and let proc the Full T2-Bonus.
(Don't use this Bonus yet!)
3. Go into the instance and begin the fight. (T2-Bonus should remain on the tank)
4. Fight is bugged an the bonus doesn't fade. The tank parry's all!! attacks.
After 5-6 minutes the encounter should be down and you get T3 Spaulders 4-free.
The tier2 bonus that we are exploiting
Attachment 121
Important:
Nobody should get aggro except the tank with the bugged bonus. Otherwise this person gets 20k dmg instant or something like that.