When an existing customer becomes a politically exposed person (PEP), the KYC analyst should perform enhanced due diligence (EDD) for that customer. EDD involves gathering additional information about the customer, assessing the risk associated with their PEP status, and updating the KYC profile accordingly. The goal is to ensure compliance with regulations, verify customer identities, and mitigate the higher risk posed by PEPs. Regular monitoring and updates during the review/refresh period are essential to stay informed about any changes in the customer's status or risk profile1.
References:
PEP in KYC & KYB: Requirements and Steps for PEP Screening
Politically Exposed Persons (PEP): Definition and Risks | Okta
How to effectively screen PEPs to meet KYC requirements - Castellum.AI

Cryptocurrency is a digital or virtual currency that uses cryptography to secure and verify transactions.
Cryptocurrencies are decentralized and operate outside the control of any central authority, such as a government or a bank. This makes them attractive for money launderers, who can use them to transfer funds anonymously, quickly, and globally, without leaving a trace or being subject to regulation. Cryptocurrencies pose more risk of money laundering than other sources of money, such as wire transfers, credit cards, or money service businesses, which are subject to more oversight, verification, and reporting requirements.
CAMS Study Guide, 6th Edition, Chapter 1, Section 1.9, page 37
CAMS eLearning Course, Module 1, Lesson 9
ACAMS Crypto Hub
Reference: https://complyadvantage.com/knowledgebase/money-laundering-crypto-exchanges/

According to the Wolfsberg Principles on Correspondent Banking1, an institution should consider the following three elements in its enhanced due diligence process for higher risk respondent bank customers:
The quality of the respondent's AML and client identification controls: The correspondent should assess the adequacy and effectiveness of the respondent's AML policies, procedures, and systems, as well as its compliance with applicable AML laws and regulations. The correspondent should also verify that the respondent has implemented appropriate customer identification and verification measures, and that it maintains sufficient records of its customers and transactions.
A risk-based determination as to whether or not the respondent is a shell bank: The correspondent should ensure that the respondent is not a shell bank, which is defined as a bank that has no physical presence in any country and is not affiliated with a regulated financial group. The correspondent should also avoid establishing or maintaining relationships with banks that are known to allow their accounts to be used by shell banks.
Whether a Politically Exposed Person (PEP) has an interest or management role in the respondent: The correspondent should identify and assess the potential risks associated with any PEPs who have an ownership or management interest in the respondent, or who are customers of the respondent. The correspondent should apply enhanced scrutiny and monitoring to such relationships, and obtain senior management approval before establishing or continuing them.
Wolfsberg Correspondent Banking Principles 2022 by the Wolfsberg Group, October 2022.