Efthreeoh - thanks, very good guidance!
I followed your advice, and found a great thread from ENINTY, linked below. In short, if I get code "2E81 (Electrical Cooling Pump: Speed Deviation)", then replace the pump soon.
So, I'm likely going to purchase the Bavarian Technic 'Enthusiast kit - option 1', found in link below. Although I do wonder if it will be useful for other tasks, like coding, registering a new battery, etc.