Latest.....for all those with coupes, it IS possible to unlock the trunk by removing the license plate lamps. Unlike the roadsters, there is no emergency cable to pull, or secondary electric lock to push on to engage the pawl. You basically have to reach past the actuator (on the drivers side), and push the pawl along to engage the handle. Basically this has to be done by feel, as it is not possible to see the pawl, I studied a picture of the lock to see where it is located.
Once in the trunk, the diagnosis was confirmed, as foam around the pump was soaking. Also whilst the trim panels are off, there's an emergency release for the gas cap, there should really be one for the trunk!
Anyway dried the pump out, cleaned the connections, and hope when I reinstall it, all is ok, otherwise I'm on the lookout for a new pump.
If it works, all it cost me was two license plate lamps, as the clips broke on both ends whilst trying to remove them.....:0)