A distinction can be made between repair and refurbishment of products.
Repairing an item is simply fixing the fault which has made it inoperable. It may also include some of the actions that are part of the refurbishment process.
Refurbishment can include repairs, and is done if needed, but is a lengthier process that includes cleaning, lubrication, oil changes, replacement of consumable items, doing a factory reset, doing cosmetic improvements, carrying out firmware upgrades, doing factory specified or in house recommended changes, replacement and/or upgrading capacitors, packaging the item for resale, along with any number of other actions.
Repairing and refurbishment are done for both customers items and for received stock that is to be on sold. When a customer requests repairs to an item that is what is done but a recommendation may be made that extra work is done to improve the reliability of the product.
Whether a product requires repair of refurbishment to be on sold depends entirely on the nature of the product. A television for instance may only need a repair by replacing capacitors in the power supply to produce a saleable product. On the other hand an air compressor may need repairs as well as an oil change, tank inspection, leak testing, gauge calibration, etc before being sold.
Reduce, repair, reuse, repurpose, refurbish, recycle.