There was already quite a mess from the leaking electrolytic capacitors:

Main board

After removing the old capacitors I gave the board a thorough cleaning:

A few suspect traces were found, these will be cleaned, tinned and protected with new solder mask.

And here is the finished result, the old electrolytic capacitors have been replaced with tantalum versions, bad traces have been repaired, the whole board has been thoroughly cleaned and a new battery fitted:

Here is the machine powered:

Power supply

Once the motherboard was done, it was time to move on to the power supply.

Overall it was cleaner than I had expected, but the fan was pretty crusty:

After cleaning, I found it spun freely, so no need to replace it:

Here are all the capacitors removed:

And the following are pictures of the power supply being re-assembled with the new capacitors, aside from the electrolytics I also replaced 4 Rifa capacitors which can cause a lot of problems:

Floppy drive

The floppy drive was particularly bad, there was a huge amount of caked on dirt inside:

Here is the drive fully disassembled:

And the same parts cleaned:

Here it is reassembled, but unfortunately I found more problems while testing. Whenever a floppy is inserted, it is ejected straight away again.

I ended up testing with a head assembly from another drive, which worked perfectly. After this I measured the resistance between the pins on each of the header cables. I found that on a known good head assembly all the pins had a small amount of resistance between them, while the bad heads tested open circuit on several pins.