All the new Clean Cab radios built on the Kenwood RF chassis and I am sure the Icom's too can be lowered to 10 watts or less even down to possibly 1 watt. We had to lower power on one channel due to licensing in our Quest Rail radios (Kenwood chassis). The Mot Clean cabs were Spectra or Astro Spectra mobiles inside, and the old Motorola Spectra or Astro Clean Cab's didn't like going below 20-25 watts.
The Syntor Clean Cab/Coach was a strange brew, looked more like the insides of a MCX-1000, and the very old NYCTA lunchbox radio (HT-200) made by Mot were 1 watt (don't need much power when the radiax cable is less than 10 feet away from your antenna), with the newer GE versions at 20 watt.
So it really depends on what manufacturer built your radio, and when. It is also possible the radio shop has lowered the power to cut interference to the PTC radio.