ManualsLib has the manual for the Panasonic KX-TG8421E digital cordless answering system here: https://www.manualslib.com/manual/650444/Panasonic-Kx-Tg8421e.html . You will need to solve a Captcha if you want the manual as a PDF. The manual as a PDF is also available here: http://www.telephonesuk.co.uk/user_guides/DECT_Phones/KX-TG8421E_User_Guide_PNQX1708ZA.pdf .
I hope this helps. Note: the last digit indicates the number of handsets in the package. The E indicates where the phone system was sold.
Cindy Wells
Testimonial: "Many thanks very useful."
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