Rotel RB970 BX Mk II crackly output from right channel

[MJ48K]

My Rotel RB970 BX mk II has been in use for 20+ years now and has recently developed a crackle on the right channel even when no input is being sent from the pre-amp. A long while ago I did open it up for a general dust and noticed some corrosion (or leaking?) around where the four big capacitors sit on the board. I'll try to dig out those pictures.
Any thoughts on what has suddenly caused the crackle to develop?
Is it likely to be terminal?
Thanks!

 

[MJ48K]

These were taken Dec 2021...

 

[rayma]

Definitely needs service, and worse things could happen if it is used further.
Strongly recommend that you don't use it any more until it is repaired.

 

[MJ48K]

Thanks...yeah. I was worried if this could pose any risk...
Need to find somewhere than can do a service...

 

[rayma]

It would be a common job at a decent tech's repair shop (unless there are other problems as well).
Suitable parts are readily available. Board cleaning would be the hardest part.