Bert's Automotive on Kingsway 2 blocks east of Fraser. Excellent place! Not the cheapest, but they do excellent work!
After 230,000 km the lockup clutch would start slipping after transmission warmed up. This is common problem on 4L60E as the steel valve in aluminum valve body eventually wears the valve bore until enough pressure is lost allowing lockup clutch to slip. Once the transmission detects slipping it locks out the lockup clutch until next start. ECU confirms the lockup functionality at 80 km (50 mph) in 4th gear. If it fails it sets a PID and turns check lamp on after 3 fails.
Had he valve body reamed out and sleeve pressed in. They cleaned transmission out and flushed cooler lines and replaced all u the joints. $1150 bucks.