One of my Deco units has been making a twittering / squealing noise for some time now.

Having read a number of threads, the issue seems to be the two 16v 470uF capacitors.

I opened my unit up but none of the capacitors had bulging tops as is generally described.

Anyway, I replaced the two 16v 470uF capacitors and plugged the unit into the power supply but it was still making the same noise.

Has anyone else had this issue who could give me some advice please?

Thanks