Keep the settings beside the symptom
Record the input channel, coupling, termination, vertical scale and timebase from the saved setup or inspection note. Identify the probe model and attenuation setting. An existing screenshot can show the trigger status, message and channel settings more clearly than a general description of a poor trace.
If another channel or probe has already been compared under the site's procedure, report that observation. Do not repeat an overload or connect a damaged input to recreate the problem. Mention visible connector damage, a known drop or a previous repair, and leave the covers fitted for assessment.
What should the estimate cover?
A display or control fault can prevent normal use while leaving the state of the measurement channels unknown. Ask for a model-specific assessment and name the person who can approve parts or a replacement recommendation. Availability depends on the instrument's condition and the support available for that model.
If the oscilloscope will return to controlled inspection, list the channels and measurement functions that need results after any work. A repair alone does not confirm amplitude, timebase or frequency-response performance. Include the probe-channel pairings that must be considered and agree the required calibration separately.
Preserve the saved work and accessories
Keep your own copy of required setups and waveform records before releasing the instrument. List probes, adapters and any external power module in the dispatch note. Confirm which items should travel after the assessment request is reviewed, and identify the engineer who will receive and check the returned kit.