Wood Planer Diagnostic & Calibration Service/Kit

The user's planer is producing 'cupped boards' after years of good performance, and they are struggling to 'diagnose this problem'. They suspect 'rollers? the bed? the blades?' and are asking for help figuring out 'where it's coming from'. This highlights a need for a service or a product that helps experienced DIYers and woodworkers diagnose and recalibrate their power tools when they start to malfunction. This could be a specialized diagnostic tool kit with instructions, or an online service offering guided troubleshooting and calibration advice for common planer issues.