My 1998 Honda Civic DX, hatchback has developed a problem with the hatchback's lock. One week ago we discovered that the external release handle will not open the hatchback now. When testing locking/unlocking with a key, I can see that the locking post moves up/down as normal. Yet, the hatchback will no longer unlock. I did lubricate the hatchback mechanism about 3 weeks ago with WD-40. Worked fine at that time. Any suggestions? Thanks!