As of today, that Fisher & Paykel E331T has well and truly died (with furious beeping and whacked-out temperatures, which have forced most of the frozen food to be discarded). Considering that it had only barely enough capacity and that the space provided won't allow anything much larger, I ultimately decided to replace it with a stand-alone fridge in the original space, and a chest freezer in another spot (a few metres away). (Both from Hisense - which may not be the best-regarded brand in the world, but if it's worth anything, they're claimed to tolerate up to 43°C ambient - models HR6AF243 and HR6CF146 respectively. Refrigerant in them is R600a which as I've mentioned elsewhere, is
not to my liking, but frankly, there's not that much choice nowadays. I did also find out about Mitsubishi Electric's MRBF325C which is a bottom-mount model that would fit in the space, exists in a stainless steel version, still has R134a refrigerant, with a 5-year warranty - but it wasn't in stock locally.)
I'll just have to hope that they contain themselves, as I don't own the kind of armour that would be needed to survive a substantial explosion (and even if I did, it would probably be much too cumbersome to wear daily). I
did retrieve that rewireable plug (and the cord that was used with it, which will need a good cleaning…), so I should be able to illustrate how it's wired some time soon - in another thread.
UPDATE:
Here is the plug.