[s-cars] central locking system pump

[stefan13@att.net]

My central locking system has been acting up.  It locks perfectly fine.  The pump comes on for a few seconds and shuts off when all doors are locked.  However, when unlocking, the pump runs for another 10 seconds or so after all the doors seem to have unlocked.  Do I have  vacuum leak, or a bad pump, or both? Where do I point the hammer?  Thanks in advance.

Stefan