This list provides recalls & warranty information on certain makers and types of appliances. You must direct the customer to the manufacturers before any attempts to repair.
You can refer to the links below for reference
Important Note: Each maker has a different set of processes for filing a claim, however, most of them will decline unauthorized services on their brands. A customer must be notified that their appliances' warranty may be voided once a different service provider does repairs on the unit.
Bosch