Maintenance service report: a practical template
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JOB — Reference, date, start time and finish time
SITE — Name, address, location and on-site contact
ASSET — Description, identifier and reference checked on site
TECHNICIAN — Name, company and role
REQUEST — Reported symptom, context and customer request
FINDINGS — Observations made on site
DIAGNOSIS — Confirmed cause or hypotheses requiring investigation
WORK — Operations actually performed
PARTS — References and quantities used; parts required listed separately
CHECKS — Type of check and observed result
FINAL STATE — Resolved, partly resolved, unresolved or further checking needed
FOLLOW-UP — Action, owner and agreed date, or “to be confirmed”
ATTACHMENTS — Identified documents or photographs where useful
REVIEW — Report review and the approval process agreed for this job

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