Go to the California database and look up Valley and Northern Divisions. I don't use PL tones but here are the frequencies:
Susanville - Amber 42.08 (B), 42.76 (M), Amber-3 45.1 ( I've only heard once as a test). 44.98 Blue North.
Chico - Gray 45.6 (B), 42.88 (M) Blue Valley 44.84. Chico dispatches Truckee. Some of the Gray sites are repeated, some are not, such as Peavine - not repeated. Amber not repeated either.
Note the alternate channel designations such as Blue 1, 2, 3 etc. have been dropped; the channels are now referred to as the color only. Areas in transition used alternate alternate channel designations temporarily for the cutover to the new channels.