[Ti] Non functioning powerbook keys

[Amara Graps]

I have a Powerbook G4 Titanium, machine specs:
Machine Model: PowerBook G4 15" CPU Type: PowerPC G4 (3.3)
Number Of CPUs: 1 CPU Speed: 1 GHz L2 Cache (per CPU): 256 KB
L3 Cache (per CPU): 1 MB Memory: 1 GB Bus Speed: 133 MHz Boot
ROM Version: 4.5.3f2 Serial Number: QT302097N4M

and the keyboard is malfunctioning (delete, space, tab, quote
keys are not working). Suggested steps? (pins to clean or check)
or is the only solution to replace the keyboard?

Amara