On Wed, 16 Mar 2016 09:42:30 -0700, DaveC wrote:

€œchecked out fine...€� means you tested what? Capacitance? ESR?
In-circuit? Removed?

Details!

The ESRs were slightly high (in circuit) but not enough to cause sudden
total failure. But they appear to be easily removeable so I'll take them
out and check them independently.
I should repeat I don't have the time right now to go down every avenue
if this turns out to be more than a simple fix; I'm really just trying to
establish whether the thing is salvageable at all. However, I am noting
down all the suggestions made here for future reference for when I do
have time.