OK. After spending about 3 hours of quality time with my Xacto set and the TDC amplifier, I have removed enough if the silicon to see that I do not have any broken or weak solder joints on the printed circuit board. I'm now thinking one of the electrical components. Based on the clock issue, my first thought is the FRAKO capacitor. I would welcome any other thoughts at this point.

The capacitor identification on the top is weak, but appears to be marked "100/16 FRAKO T2." The only number I am uncertain of here is the 100 microfarad rating, as a large portion of the number is missing. Can someone confirm this to be correct? The clock capacitor, rated 100/16, was labeled "100/16 FRAKO P8."

I have posted a couple pictures of the TDC amp innards for those who are interested. They are at:

http://web.infoave.net/~ontheriver/automobiles/tdcamp.htm

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https://goo.gl/photos/J8ZUVvAYiYqLxbD18

1989 560SL 111Kmi
2007 E550 4Matic 157 Kmi
2000 F250SD 7.3l, 1996 Explorer Ltd 5.0l
1965 VW Beetle Deluxe 115 Kmi
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Previous MB:
1983 240D Euro Manual 144 Kmi
1983 300SD 495 Kmi
1986 190D 2.5 100 Kmi
1986 300SDL 202 Kmi
1991 300D 2.5 Turbo 91 Kmi
1998 E320S4 (4-matic wagon) 140 Kmi