Yesterday morning, I noticed water dripping from the top middle of this 1998 refrigerator/freezer and accumulating in the recesses under the crisper drawers. Removed all shelving and food from the fridge part and checked the drip pan (dry); placed towels on the plastic "shelf" under the drip and in the bottom of the fridge; and monitored the problem. The drip almost stopped in the afternoon, only to start up again with vigor around 7 p.m. The freezer is still working. I removed most of the food from the freezer last night just in case it went on the fritz, too.

Just checked the fridge and freezer. Freezer is still cold and remaining food is still frozen. The towels absorbed the dripping water in the fridge, which is maintaining its cold temperature, but the towels on the shelf underneath the drip have frost on them. There are water droplets on the back middle wall but right now (2:43 p.m. Eastern), water isn't steadily pouring out of the top back middle of the fridge.

Does anyone know where I can find the drip line in this refrigerator to check for blockages?

What parts should I replace, and in what order? Thanks for any expert advice you can give!