Cobra 29 channel 19 on 18 sometimes

I am working on my buddy's 29, he's having problems with it drifting channels. Sometimes he will lose people on 19 flip to 18 and there they are. I have checked the voltages on the 2816 PLL and they are good. Pin 10 is perfect at 5.12 mhz, pins 12 and 13 are dead on at 10.24. Pin 22 is the one that has me stymied. It reads about 3.89 mhz on ch. 1 RX, and 26.965 TX. I know that it should be .91 and 1.365. BTW, IC2 is good as far as voltages. Also, someone put an echo in and used the...

Cobra 29 channel 19 on 18 sometimes