This appears to be a Lenovo service part number for a hardware installation (likely for a ThinkSystem HX series appliance, indicated by 'HX') performed after business hours.
The 'AFT HRS' likely signifies 'After Hours'.
The '5AS7B15946' is the specific part identifier.
Without further context or access to Lenovo's internal parts database, detailed hardware specifications for this specific service part cannot be determined. It's not a component with standard user-facing specs.