While I have not experienced (yet) any central locking pump problem, there is some history of water leaks causing damage when allowed to enter/accumulate in the trunk "basement" where this component lives. We have an N/A Roadster and had the very common failure of the rear window glass adhesion to the top material, since replaced. (Chrysler special warranty replaced entire roof tops, but only for a select group of owners, based upon the State of original sale...sucked for the rest of us). Coupes were also subject to water trunk leaks due to failure at the spoiler sealing points, (I believe). Several years ago, my inspection showed no sign of water intrusion @ the central locking pump, (it never rains in so-cal, but sometimes it pours) I followed a tip on drilling a couple of drain holes, near the locking pump & 1 in the fender well, where some have reported water leaking past the fuel filler, (as a precaution).
Much has been written here about the central locking pump, which has both a pneumatic & electrical component, ( & I believe the locking of the doors/trunk are affected).
Plz post about your progress & good luck.