Possible source - call them to request assistance.

https://indoorcomfortsupply.com/mastercool-pad-28x40x12-6500-for-adobeair-symphony-coolers-dpm220b-gpad220/

Possible similar model part diagram:
https://indoorcomfortsupply.com/adobeair-mastercool-hc64-a-h-parts-breakdown-list/