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OPA4340: Package marking decode

Part Number: OPA4340

I am investigating an OPA4340 which failed. 

Would someone please tell me when this chip was assembled and if it is affected by PCN# 20140409000 (i.e. which material was used for the bond wires)?

The specific part information is below:
Part number: OPA4340UA
Device marking: 7A8864K 

Thanks!