Here are some links to repair tips and reference material.
vintageTEK Museum Product Repair
310 Calibration Procedure January 1956
468 Mostek MKB36000 ROM Repairs
535 Calibration Procedure December 1955
7854 Mostek MKB36000 ROM Repairs
Circuit Descriptions with Chuck Miller
Dallas DS1287 Dead Battery Repair
Fundamental Electronic Concepts for Oscilloscope Use and Maintenance 1956
Keytronic Capactive Keyboard Repair
Primer of Waveforms and their Oscilloscope Display 1960
Repairing Plastic Knobs and Gears
Tektronix Modification Numbering System 1968
Tektronix Standards: Abbreviations To Terms 1967
Tektronix Standards: Glossary of Technical Terms - Electronics 1967
Tektronix Standards: Terms to Abbreviations 1967
Troubleshooting Your Oscilloscope
Using the Oscilloscope as an Instrumentation Maintenance Aid 1958
- 7L12 Spectrum Analyzer Plug-in
- Casting a Replacement Knob
- 468 +5V Storage Supply