Hi, sorry for my english...i'm italian... My name il Francesco and I say hello to all! now...the big problem... My mbpro early 2011 has a problem with a sensor. The apple hardware test error is : 4SNS/1/40000001 : VPOR - 0.592 I've searched in the internet and i find a few of post that indicate a "pbus voltage sensor" issue. Now, i cant find a schematics that i can use to know where and what is this component... I have a friend that can repair if identify the component and i hope that i'll find the exact position of this sensor because certainly will be a cheapy component but if i send the mac to apple the repair will be very expansive... Can you help me??