Unit in basement leaking around bottom

It sounds like a blocked evap. pan. If you have access to the drain line like a tee in the condensate line, you can blow it out with nitrogen or co2. If you cannot access your condensate line, you will have to remove the access panel on your indoor coil. remove the tape and unscrew the panel door be carefull not to upset the copper lines running into the door. Good luck.

The drain line coming from the internal drain pan to the pump is clogged, causing overflow of the internal pan. That means the water never reaches the pump, and is simply overflowing into the bottom of the unit/duct.

The drain line and pan need to be cleaned and cleared.

A shop vac is a wonderful tool for such a job.