The Nimbus PC-186 had competition from aftermarket suppliers, like this example from Centec, which is a 1Mb memory upgrade board.
Unfortunately the board has suffered from failing ceramic capacitors and as such needs to be repaired.
The phillips ceramic capacitors, as can be seen, have started to fall apart or in one case explode
Here we will remove the old capacitors with the help of a desoldering gun and replace with new 220pf caps.