die Behebung
fixing
The elimination of an error, defect, or problem.
Die Behebung des Wasserschadens wird mehrere Tage dauern.
Fixing the water damage will take several days.

fixing / resolution
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fixing
The elimination of an error, defect, or problem.
Die Behebung des Wasserschadens wird mehrere Tage dauern.
Fixing the water damage will take several days.

'Die Behebung' is the noun derived from the verb 'beheben' (to fix/remedy). The verb means to eliminate an error or a problem. The noun describes this action or its result.
Der Techniker konnte das Problem schnell beheben.
The technician was able to fix the problem quickly.
This word belongs to formal written language or technical language. It is often found in official notices, reports, or business contexts. In everyday language, you would be more likely to say 'Reparatur' (repair) or 'Lösung' (solution).
Wir bitten um Ihr Verständnis, während wir an der Behebung der Störung arbeiten.
We ask for your understanding while we work on fixing the disruption.
The noun 'Behebung' is very often used with a genitive object that describes the problem. For example: 'die Behebung des Fehlers' (the fixing of the error) or 'die Behebung des Mangels' (the correction of the defect).
Die Behebung des Softwarefehlers hat Priorität.
Fixing the software error is a priority.
'Behebung' is always used in connection with negative things that need to be eliminated. Typical combinations are 'Behebung eines Schadens' (repairing damage), 'eines Fehlers' (fixing an error), 'eines Mangels' (correcting a defect), or 'einer Störung' (resolving a disruption).
Die Firma ist für die Behebung aller Mängel verantwortlich.
The company is responsible for fixing all defects.
solution
'die Lösung' and 'die Behebung' can both mean that a problem no longer exists. 'die Lösung' is more general and can be a plan, an idea, or a way to end a difficult situation. 'die Behebung' is used especially when an error, defect, or malfunction is actually eliminated. That is why 'Behebung' often sounds more technical or formal. You can first find a solution and then begin fixing the error.

Die Behebung des Fehlers dauert voraussichtlich bis morgen.
Fixing the error is expected to take until tomorrow.
Der Kunde fragt beim Termin, ob es für das Problem eine einfache Lösung gibt.
At the appointment, the customer asks whether there is a simple solution to the problem.