Teledyne 3290 Operating Instructions Manual page 44

Maintenance
If a cell was working satisfactorily, but ceases to function before
the warranty period expires, the customer will receive credit toward the
purchase of a new cell.
With any warranty claim, the customer must return the cell in
question to the factory for evaluation. If it is determined that failure is
due to faulty workmanship or material, the cell will be replaced at no
cost to the customer.
Note: Evidence of damage due to tampering or mishandling will
render the cell warranty null and void.
Teledyne Analytical Instruments
Model 3290
34