Equipment instructions guide the corrections
There is no universal breaker substitution, tightening value or test that applies to every panel.
Manufacturer-specified parts are one documented route. A specifically classified replacement is another only when the exact breaker-and-panel combination, ratings, limitations and installation requirements are verified. Eaton's classified-breaker documentation is model-specific; it does not make every Eaton breaker a universal replacement.
Connection work follows the applicable terminal markings and manufacturer procedure. Tightening every screw is not automatically an improvement: Schneider's covered maintenance guidance says not to disturb or retorque connections without evidence of overheating or looseness. Your professional should determine the appropriate action for your actual equipment.
Ask which checks will be performed and what they establish. A normal voltage reading, thermal image, handle operation or test-button response is not a complete certification of every breaker or every circuit. The agreed scope should identify retained components, installed parts, corrections, completed checks and remaining concerns.
Sources: QO and Homeline Load Centers - S1B33894 · 0600IB1201, Section 2: Visual Inspection and Preventive Maintenance · 0600IB1201, Section 1: Introduction · Classified Circuit Breakers · Panelboard/Meter Center Compatibility List - IL00304001Y