Dennis i regret to inform you that the parts you see advertised on ebay are indeed genuine but as you say you need expensive tools and a lot of knowledge.
I am a mobile phone techician and had a few problem like that, it is not worth the hassle as you need a digital slodering station at a cost of £2500-£4000 depending where you buy, also you need soldering balls ratio 67 and of course agood dose of good old fashioned level 2 service knowledge.
oh and one more thing you need a steady hand.
Do you still think you could carry out the repairs yourself?
Alex
April 2008