I'm pretty sure my logic board is bad in my MP 5.1. I had flakey behavior on power up or sleep but now I've lost ethernet port 1 and any time the machine tries to sleep it immediately restarts. I have removed all hardware but one drive, one clean install of 10.9.5, no other software, and the problem still exists so I know it's the machine. So my question to any who have taken their cheese graters in to apple, what should I expect for a logic board replacement? How long will my down time be? I have apple care so I'm asking just about time not cost.