No DAB reception on Ferguson FRG-R121D-what is the cause?

Having replaced two faulty electrolytic capacitors on the audio board, one of which(a 2200uf 10v) was bulging, I now have good FM reception, the clock and all controls are working, but there is no DAB reception, although station names, etc., are displayed. There are sometimes sudden crackling noises in DAB mode. What is likely to be the cause of this fault? Other Electrolytic Capacitors maybe?