All the actuator does is physically move the metal hook thingy in the door to lock/unlock it. An aftermarket one like Mongoose will work, drill and mount it in place, then hook it into existing wires. Don't need to remove the broken one, which is a tedious job as well sitting in awkward spot.

If you take it to any car audio/alarm shop that has done EP3/DC5s, just say you think the actuators fukd and want to put in an aftermarket one they'll probably know what you mean. Otherwise ebay, probably set you back $10 or $20