Please deliver the replacement audio file (16 bit WAV, 1411 kbps.) to Beatport via the "Content Delivery" tab in Baseware (https://baseware.beatport.com). In order to specify which track this is intended to replace please name the audio file according to catalog number and the track number it corresponds to on the existing release.
For example, if the release with catalog number CATNUM needs the second track replaced please name the audio file CATNUM_2.wav
If the track is entirely different rather than just an audio replacement please include new metadata, including ISRC code, as well.
Name your delivery/folder in the following fashion:
(Label Name - CAT# - REPLACEMENT)
*To follow up on your delivery you may reach out to email@example.com