S-Line 2.0TDi PRNDS Problem - All letters highlighted
I have an A4 Avant 2.0TDi Auto S-Line on a 55 plate with 127k on the clock. It has been serviced by Audi since day one, and I have recently noticed on my dash that all the letters on the PRNDS transmission indicator are often highlighted in red. I should say that nothing is flashing at this point (which I believe is another problem owners have experienced and has proved to be an expensive repair). This issue is an intermittent one and often the display reverts to the correct display - i.e. 'D' for drive.
Just really wanting to know if anyone else has experienced the same problem, and what the likely cause of this is. I am wary about putting it into a garage (especially at this time of year) until I have some background on the problem, as I suspect they may tell me the worst case scenario and charge me a fortune (£1500ish in some cases) to repair it.
Is there software available that I can install on my laptop, where if I purchased the cable it to connect it to my car would tell me the exact problem?
Thanks in advance