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TSB41AB2: What IC should I use in my M-Audio Profire 2626

Part Number: TSB41AB2

My PC does not recognize my M-Audio Prodire 2626 anymore. I will try to replace the TSB41AB2 (firewire controller). But there is 2 diffferent CI's to buy here:

-TSB41AB2PAPG4

-TSB41AB2PAPRG4

What of them should I use?  

In this link I found a guy that replaced sucessfulley this component in a M-Audio profire 2626..

Someone knows what of these codes above should I buy?

Thanks

Daniel Oliveira (from brazil)