Mr Ufondu

Need an advise on what might be the problem with my 2004 Lexus Rx 330 Sound/Stereo system. My electrician mistakenly tapped current for a DVD headrest he was installing from the drivers front speaker. And since then the two front speakers have stopped working and the sound system now randomly jump from CD to CD, from track to track, the radio tunes from one channel to another and the volume increases on its own. Just need an advise on how to handle this issue.