I have a TPI4202 that needs repair.
The TPI4000 Series (TPI4202 and TPI4208) were OEM products that Tektronix resold under the Tektronix name. Tektronix no longer provides repair for these models. Repair for this model/series is through the OEM manufacture, Absolute Analysis. Their web site is:http://www.absoluteanalysis.com/investigator/