Old catering gear is a favourite with the engineer on a comission...
Sharp intake of breath when you are shown the "vintage" item, tool bag on the deck, open the beastie up, lots of muttering (oh dear, dear-oh-dear...), stands up to face the customer whilst taking another deep breath...
You just know it's going to be expensive... you have my commiserations if it's this road... may you could change your byline to compressor from oil-filter... (ducking)
I remember working in a restaurant one winter after being called out to repair an icemaker that wasn't making ice - the joiks had put it in the yard - it was minus three degrees celcius - I will always cherish the look on there faces when they realised their stupidity... (worked fine in the summer, they said
)