Meaning of GUARANTEE in English
BAD : May I remind you that the cassette recorder is still in guarantee.
GOOD : May I remind you that the cassette recorder is still under guarantee.
under guarantee (NOT in ): 'The watch was still under guarantee so they repaired it free of charge.'
Longman Common Errors English vocabulary. Английский словарь распространенных ошибок Longman. 2012