Vintage Synth Repair

Hi all,

I'm trying to solve a problem with a P5 I just got.

It looks like the -15v rail on the main board is shorting.
Each time I'll power it up, the 10uf tantalum capacitor which filters
the -15v is getting fried and open (shorting) immediately.

Any ideas where to start looking at ? Any common parts on the P5 with
are known to short over time ?

Thanks for the help !