I know that if you go through GPI, they will give you 2k on the heads for a core charge. If they have cores available to rework, you can pay 4k upfront, they'll send you the new heads, then you can send yours back and get 2k back (thats what I did when I used them actually)... Or of course you can simply send them in and pay 2k to have them reworked, the same as any place.
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