Manual Seat Adjuster Does Not Lock for GMC Truck TopKick C-Series (Conventional) C4/C5 2007

Problem	Action
The locking wire is too tight.	Loosen the locking wire.
The adjuster lock bar spring is disconnected or broken.	Repair or replace the spring.
The adjuster lock bar is sticking or binding.	Lubricate the lock bar pivot or replace the adjuster.