Is this from heater core or connection through firewall?

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Joined
Oct 30, 2024
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1
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Location
Pennsylvania
96 fzj80. Coolant leak is coming down from behind rubber mat against firewall. See picture. Bottom of heater core box and all I can see around it looks dry. Has anyone seen a leak showing in this location and have a good guess at where it's starting? Is this basically a heater core replacement regardless? Appreciate any guidance I can get. Thanks.

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