Final answer:
To look up a customer's Service Center, access the company's customer service portal or call directly. The Channel Line-up can typically be found on the TV service provider's website, using tools to search by subscription and location.
Step-by-step explanation:
Looking up a customer's Service Center typically involves accessing the customer service portal or database of the company providing the service.
For TV service providers, this could mean navigating through the provider's website using the customer's account information or using a customer service number to procure such information directly.
On the other hand, finding a Channel Line-up can be done by visiting the TV service provider's official website, where they often have tools or resources like searchable databases or PDF documents that allow customers to view the channels available to them based on their subscription package and geographical location.