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One possible scenario could be a door not latched properly, and then appearing slightly open (triggering the warning lights and Master Caution) just after lift-off.
But, all Boeings are pressurized on the ground to 0.125 PSI when pressurization is operated in 'AUTO'(to reduce pressure "bumps" in people's ears); but an inward-opening door can still be operated if need be at that minimal PSID, so I suppose a door could shake loose from its latching mechanism.
Here's a similar (?) NASA ASRS report from 2010:
http://www.37000feet.com/report/877694/B737-700-returned-to-the-departure-airport-when-an-aft-cargo-door