2010 RX350 / Radio controls not working on dash.

[robins13]

Just bought used 2010 rx350 and discovered that the dash radio controls are not working. Steering wheel ones do work.  Read about pressing on left side of radio which might make it work.  Last ditch effort and it seems to work.  I had to press very hard on left side of radio but doing so made the controls to light up.  Had to press extremely hard, but they don't stay on. Any suggestions?  Thanks!!

[Lexus Owners Club]

It could probably benefit from being stripped down to clean the internal contacts and go from there.