I have a Ranger (Mirage) 2950, this radio does not like the cold. This radio resets itself to 28.000 Mhz or, will turn on and be stuck at 31.999 Mhz until I go to the "Manual" mode and tap the transmit button. CB Tricks says that there is a battery for the cmos in the CPU but, I do not see it; it does not seem to be accessable from the inside of the radio without removing the front panel from the display AFTER the display unit has been separated from the chassis. I must be missing something...... I like this radio alot and, I am wondering if there is someone Trustworthy and reliable who has repaired RCI radios. I am looking for someone with knowledge of the quirks of these radios. My service monitor / scope crapped out so, I am kinda like a row boat with only one oar in the water. The CPU board in this radio is is the DPT295042z, the same boards are in the 2527, the RCI 2950, 2970 and, the RCi 2990. The CPU / PLL goes crazy and thre radio has to be reset to the desire operating frequency when powered back on. The is no visibile battery backup for the CPU ROM so, it seems to be erased every time it is powered or or off. this is the board .