I put here in one (hmm... in truth, was on 2 threads) the complete list of electrolytic capacitors needed for the A600/1200. Even the code on the boards are the very same.
Just do a search for "capacitors list" with my name in it. [EDIT] No need to. Here is the
link Since you broken the warranty seal, it's a good thing to measure the voltage levels on the floppy power connector. +5V must be 4.85V at least. +12V must in the 10.5~12V range. If you find one of the voltage levels wrong, you can simply convert an AT/ATX pc PSU to use in your Amiga.
In case of no-go (voltage OK), probably you need to replace the floppy unit. Search on my pictures (here on A.org) on how to convert a pc unit to work.