I replaced my pump after it starting leaking at the seals. This is relatively common. Got my pump for $68. Took 20 minutes to replace. No issue since. Rumor was that if you didn't use BMW windshield wiper fluid, this is common. I was running meth. The new pump had a different P/N than the old one and looked slightly different. I'm not sure if its improved or not.
'09 E90 M3 | VF620 SC tuned and coded by BPM | KW V3 | ARC Wheels w/AD08 | OnEighty Lights | AA Signature Exhaust | BMW Performance and IND trim | Recaro Profi and child seats
'13 35i M-Sport X3 | JB4 Stage 1 | BMS Intake | H&R Springs | Gloss black grill | CF Wrap and Coded by me