Upon arrival 2019 Trane Heatpump was out on soft lock out due to the Heatpump going into defrost multiple times within the hour. Checked refrigerant pressure and found the true suction port had low pressure causing the line temp to drop rapidly in turn causing the defrost cycle to kick on multiple times. Found outdoor TXV is not adjusting and is failed. Talked with customer about pricing and customer stated she wants to wait for nowb