Well that sounds like a fun day !
Sorry I don't know the model number, but the pic you posted is definitely the machine.
It was a great machine overall. The main issues I had with it were that it didn't tumble long enough on cotton cycles during wash - it seemed to be resting more than washing. Also, although it did the fantastic high level rinses and classic Hoover distribute -> spins, this particular model would distribute from a high level rinse and then stop. It would then redistribute and spin, but not nearly as well as it would have done from the original distribute with the tub full of water because that was the whole point, and gave more even distribution! All the water sloshing round with the washing helped an effective distribute. As a result the interim spins were sometimes off balance. The final spin was spectacular though, this time a proper distribute straight to an 800 spin with `water down the glass' galore, then the classic slight dip and ramp straight to 1300 like a jet engine. Not a quiet spinner but the laundry wasn't half well spun. No silly anticrease tumbles at th'end neither, so a gorgeous `stuck to the sides of the drum' finale especially since fabric softener was never used. Ariel Ultra, and then Ariel Future, and then Ariel Futur (LOL) powder was the detergent of choice.
This machine ran the `XL' fish bar on Crwys Road, Cathays, Cardiff, for about 9 years I believe when it was finally ditched in 2000 for one of those new things which would spin with a 20p on the top - LOL. The terminal fault was that having been transported from Cardiff to London sans transit bolts, the timer stuck on distribute and wouln't advance to spin. Worn brushes? Dunno.
Hope your sister gets on with this machine and I hope she appreciates your help with the pump. The pump on ours always sounded dreadful and rattly, I assumed the spindle thing was caked in chip fat.....
Cheers