P0770/P0773 fault code at higher mileage due to failed 3-way lock-up solenoid on Toyota Celica

A code P0770 or P0773 may occur at higher mileages which indicates that the 3-way lock-up solenoid could be defective and may need replacement.
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Average mileage: 217,000 (217,000–217,000)
Drive Train affected: Automatic Transmission
3 model years affected: 1995, 1996, 1997
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problem details
1997 Toyota Celica - Automatic Transmission 217,000 mi,
P0770 code won't go away, even though the car seems to drive fine. Transmission shop says they need to replace the solenoid.