Manufacturer repair service provider is: KAVService - [https://kavservice.com/|https://kavservice.com/] . It took me eight weeks to receive my H520 back from Yuneec, and periodic updates were not provided as promised. Ordinarily, you submit repair/warranty claims thru the Yuneec website rather than direct to KAVService.
'''Alternative, third-party providers:'''
Carolina Dronz - [https://carolinadronz.com/collections/drone-service-repair-antenna-modifications|https://carolinadronz.com/collections/drone-service-repair-antenna-modifications]
FortressUAV - Plano, TX - [http://www.fortressuav.com|https://www.fortressuav.com]