Update:
On a whim, I plugged in an ethernet cable after reading a post in a different thread. It appears that I have indeed gotten the µC programmed correctly, as I found it’s IP address listed on a network scan and I was able to access its web interface. I still need to replace the DS1307, 12MHz crystal and, of course, get the LCD working properly. I have additional LCDs that I can try, but at least I can concentrate my efforts in a particular area. If you have any additional suggestions, they would be greatly appreciated. If I happen to get it repaired, I will post my findings.
Also, I received the three enclosures I ordered late last week. I will say this about your company: Your shipments and Very, Very prompt! Thanks!