The TS-950SDs I have use the Kenwood TCXO SO2. They have both drifted off frequency enough to notice, so I wanted to reset the master oscillators.
The frequency adjustment is under the TCXO label (under the "N" in Kenwood). I peeled back the label, and the adjustment was simple. I tune in WWV at frequency = 20.000 MHz, mode = AM, filters = 6 kHz, marker = on.
You can hear the beat note and adjust for zero beat. I assume I'm the only one that didn't know about this!