On the Equipment tab, list each asset once: name, category (Diagnostic, Laboratory, Theatre, Sterilisation, Cold chain and more), serial number, purchase date, warranty-until date and supplier. On the Service Log tab, record each service or repair: the date, the equipment (from a dropdown), the service type, the cost in KES and the next-service date. Back on the register, the warranty status, next service due, total maintenance cost and service status fill in against today's date, so an expired warranty or a service past its due date turns red on its own.
The Summary tab totals it for you: equipment on the register, total maintenance spend, how many warranties have lapsed and how many services are overdue or due soon. Yellow cells are for typing; the rest is locked formulas. Opens in Excel, WPS or Google Sheets.