I had to lookup the service menu, but I assume you are referring to menu items 27, 31, and 35. The description I see for each is:
HF1-L1: This sets the RF output power in the L1 power setting for HF Band 1 (0.5 watts.)
HF2-L1: Same as HF1-L1 except for HF Band 2.
HF3-L1: Same as HF1-L1 except for HF Band 3.