Here's a thought: Two of something around 4700uF/150V (MUCH easier to find), in parallel, to replace each 9300uF cap.
Just a slight bump in capacitance, which never hurts, in my experience.
The tricky part is fitment in the chassis.
If you can find some small enough, in at least 150V and mount/wire them with their terminals facing each other (save some room?); you'll be golden.
I just picked 4700uF because Newark has 176 caps, of various voltages/dimensions, in that value.
If they don't have something that fits in stock: get the data and search further for someone that does.
Of course: there are also a plethora of values that can be combined, to match or exceed the 9300uF.