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Here is a link to the RDX series page at Motorola, in the lower right corner there is a link to the user guide for your RDU2020 radio. In the user guide there is a very good explanation of matching the XU2100 to the RDU2020. The RDU radio was the next model in line after the XU2100 and was designed to work with it. http://www.motorolasolutions.com/US-EN/Business+Product+and+Services/Two-way+Radios/On-site+Business+Radios/Discontinued/RDU2020_US-EN
It may have been PLL instead of PPL. If so, that stands for Phase-Locked Loop, and is the circuit that the transmitter needs to generate the desired frequency to transmit on. That being the case, there's no user remedy and the unit must be serviced by a qualified radio shop.
The TalkAbout radios are license-free and operate on FRS/GMRS frequencies intended for family use. It is possible using them in a business situation may be outside of the license-free perimeters. You would need to check further on this through a licensing company or the FCC (www.fcc.gov)
The lower back portion of the radio is connected to the U-shaped sides. Grasp the radio and pull down on the U-shaped sides and this portion of the radio will slide down and off the radio, exposing the batteries.
To send it for repair would cost more than replacing it. I'm sorry, but unless it has a sentimental value to you, go buy another. This "planned obsolescence" built into products these days by the manufacturer makes it more expensive to repair a phone, than to buy a new one. If you are determined to get it repaired, try the "Yellow Pages.com" to find the company's telephone number. If it isn't there, chances are the company has gone out of business, and you are "up a creek without a paddle". Wish I could help more.
You have to contact motorola, buy their software and parts (the software is about $400-$2000 not counting the parts). You also need to sign the agrement with them and last you need realy old slow (286 or 386) computers running DOS. I am a dealer for them it cost me a lot of money to start.