Blue belly ,i cannot really see any good reason why you would wish to have the boost pumps and hyd pumps running during a turnround, whats the point ? as well as being a major safety issue theres wear and tear on the pumps, plus extra load on the APU to consider, (not to mention the bloody racket those AC hyd pumps make).
We look after a fair few 757/767 operators apart from our own A/C and ive never known any crews to leave the pumps on as a matter of routine