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DSTC is built into the ABS/STC Control Unit.
It seems that you already suspect the ABS/STC unit being at fault.
All the ABS control units (Installed on 96 and newer 850, 70 and S80 series) will eventually fail after they reach 65,000 miles or 5 years. The average is 85,000 miles and/or 6 years for failures.
The erratic ABS/STC/DSTC light and/or no trouble codes is an indication of a defective ABS unit.
A dealer will charge about $120.00 to diagnose the problem and tell you that you need a new ABS control unit.
Having said that. Here is an alternative to correcting the problem for good.
Vitor's web page
Click on the ABS / TRACS Repair link
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