Grip the Surface Connect cable close to the motherboard connector and peel the cable from the fan.

During reassembly:

Don't secure the trackpad cable with adhesive yet—wait until you've reconnected it. Otherwise, the cable may not reach its socket if positioned incorrectly.

If the tape is still sticky, you don't need to replace it.

If the adhesive is no longer sticky, or if you're replacing the fan and it doesn't have adhesive, apply a new strip of thin, double-sided tape to the top edge of the fan.