Repairing an LED ceiling light

A few years ago we purchased two new lights for the landing. These are square relatively low profile lights which use an array of LEDs. Normally, the LEDs in units such as these are not replaceable and if they fail the entire fitting has to be replaced. Well, a few weeks ago one of the lights failed and I decided to try to repair it because (a) it would be cheaper, (b) they are a matched pair and…