I have a 10-yr old pebble tech pool with a sump pump installed deep in the ground nearby. The previous owners installed this pump due to the clay soil and sporadic heavy rains we receive in Northern California. My problem: we had a very heavy rain recently and my sump pump has been running on/off every 5-10 seconds for several days. Not much water was coming out today, so opened up the sump pump well (it's DEEP, 8-9 feet and narrow) and discovered the electric pump was running, then water is draining back into the well. Or my pump may be becoming too sensitive and needs adjusting/replacing. In any case, it's not running as it should.

How does one access a pump that's securely fastened so deep in a such a tight spot? I couldn't see any information from others with this problem, and find it hard to believe the builders didn't make this accessible for replacing.

thanks for any/all help!
Michael