Need Help...bottom ram slot not working MBP

I have a mid 2009 MBP, i upgraded the ram to 4gb per slot a couple years ago. I did some troubleshooting and found the bottom slot is now inoperable...
3 questions:
1. Any tricks to get that bottom slot working, besides loosening the screws, or using an eraser and then a lead pencil on the connection prongs... which was suggested in ohter threads.
2. Can i use one 8gb ram in the one operable slot?
3. Where can i find a replacement part for this problem?
Any info would be greatly appreciated!

!.  No other suggestions to offer.  Bring the MBP in for a free evaluation at an Apple store genius bar.  If it is a simple repair, they may do it gratis.
2.  Yes.
3.  Try iFixit.com and Powerbookmedic.com.  They have parts, prices and instructions.
Ciao.

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