I've noticed the same thing on the last couple of pump units I've swapped out - must be the heat of the engine bay, or perhaps the heat generated by the current flowing through them when the pump motor is at full chat? Copious layers of elecrical insulation tape carefully applied also does a fine job if your nervous about cutting the supply cables to apply heatshrink.
Re: bleeding. Start on the O/S/R then N/S/R followed by O/S/F finishing N/S/F. I use a pressurised one man brake bleed kit & purge twice to be on the safe side. Brake fluid is cheap. Brake failure is not 😬.
Happy bleeding. Cheers
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