Hi, Rusty!
Progress is painfully slow......
The poor guys have been wandering about with their tracking device, whilst the errant (leaking?) pipe has remained obstinately hidden.....
However, they have now discovered it.
So we shall see what happens next.....
I did not think the puzzle too bad?
I especially liked 1d!
HOUYHNHNMS are the intelligent talking horses from Gulliver's Travels.
I agree with you, though , about 1a.
"Hippos" is the hidden answer, but I do not know why?
Nor do I know why "lieu" meaning "place" is the answer to 19a?
And I couldn't do 27a: P?N?Y?A?F
Otherwise , all done and parsed.
Dog has taken a shine to one of the workmen!