This past week i have noticed a funny whine coming from the engine when you rev high and then let off the revs it make a loud whistling noise, its quite strange, also i was overtaking in 5th gear and lost power went in to limp mode, stopped engine and started again and it boosted fine!, last night i was powering up a hill in 4th gear and agin it went in o limp mode! ive been reading some threads on here about the turbo failing! Sticky veins? what is that? i usualy do all the work on my car so, would it be worth me taking the turbo off and cleaning it up? what do the veins look like and can i just use brake cleaner to clean the turbo? Any help on this would be much appreciated.