I'm having this same problem. I've recently got leaks coming from lots of places:
- sometimes water comes out of the lid of the filter basket when I shut off the pump
- drips coming from the cartridge filter
- a few drips from one of the pipe connections
- bubbles from the outlets

They didn't all come at once -- they came in the order I listed over a few seasons. I've checked that the o-rings for the filter basket and the cartridge filter don't have cracks.

Any suggestions on how I can fix this?

Thanks.