Mazda MPV (1996) Central Locking

Hi Friends,

My power locks sometimes (most of the time!) get stuck when being locked with the wireless key fob. They move a little bit then stop. I expect it’s a bad or sticky solenoid, but is there any easy way to identify which one it is? I expect, with my luck lately, it would take me 5 removed door panels before I find the offender.

Anybody have a clever way to attack this problem?