WOW! I have never seen 110 Watt radios in the UHF band.
The tuning techs used to remove the outer cover and there were some slotted pots you could turn to adjust the wattage.
Have you looked on the web for a manual?
You could call the company I used to work for in Illinois:
Radco Communications Inc - 630-858-5212. They are pretty cool guys and may be able to help you.