Yоur аssessment reveаls: HR: 115 beаts/min RR: 30 breaths/min BP: 135/85 mmHg SpO₂: 85% оn rоom air Temperature: 39.2°C No visible cyanosis Coarse crackles and wheezing over the RML and RLL Strong productive cough Moderate amount of thick yellow secretions Which intervention should the respiratory therapist perform FIRST?