Lately, my trunk lock has trouble opening. Either from the Key Fob, or the Push Button on the left of the dash, when actuated, I hear a dull click instead of the authoritative "Kachunk" I used to hear. Often it takes a dozen tries to finally get the trunk open. Does anyone have any ideas what might be wrong? The car is of course out of warranty, and I would hope it is something I can resolve without a Tesla Service Center visit.