A golden rule in aviation maintenance is that if a specific chapter does not specify a procedure or limit, the technician must default to the standards set in Chapter 20.
For the uninitiated, the AMM is the definitive "How-To" guide for everything from changing a tire to troubleshooting complex avionics. boeing 737 amm pdf
Always ensure you are using the specific revision assigned to your aircraft's tail number, as configurations vary significantly between models (e.g., 737 Classic, NG, and MAX). A golden rule in aviation maintenance is that
: Detailed instructions for air conditioning (Ch. 21), electrical power (Ch. 24), fuel (Ch. 28), and hydraulic power (Ch. 29). electrical power (Ch. 24)