IT service report: free Word template and worked example
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JOB — Ticket reference, date and technician
SCOPE — Device or service, asset identifier and affected users or location
REQUEST — Reported symptoms, affected task and reported start time
FINDINGS — Observed behavior, checked error message and relevant version
INVESTIGATION — Checks performed and what each established
CHANGES — Actions completed; proposed changes listed separately
TESTS — Test, observed result and remaining limitation
FINAL STATE — Resolved during testing, partly resolved, unresolved or escalated
FOLLOW-UP — Open action, owner, agreed date or “to be confirmed”
REFERENCES — Relevant ticket, approved procedure or restricted attachment
REVIEW — Technician review and the organization's approval process

Template by notefield, a product of Y SAS. Adapt it to your situation.
https://notefield.work/blog/it-service-report-template