Rear Hatch is stuck...how can I get it to release so I can lubricate it?

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It's done it again--a few months ago the rear hatch seized up. The locking mechanism is working fine, however when press the handle the inside latch won't release. I have no idea how I fixed it the last time (it just randomly started working again). Anyway this is the longest it's been like this and I don't know how to manually release it from the inside. Help!