HP 24SII - Manual (Page 106)

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Since there are no adjustments and no moving parts in the Model
24SII DES, preventative maintenance is unnecessary.
If you find it necessary to return the Model 24SII DES to the factory
for warranty work or factory-set changes, follow the procedure listed
under
Section 10 for repacking.
Before you ship your unit, please call BayTech to get a Return
Authorization number. BayTech cannot accept warranty or no-charge
returns without this number.
Ship your unit to the address listed in Section 11 , - Technical Support.
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If you need to repack your unit for shipping, please choose a heavy
cardboard box for packing. Surround your unit with sufficient
insulation (a minimum of 2-inches) to withstand the rigors of transport.
Be sure to seal the box securely with strapping or packing tape.
Masking tape or cellophane tape is not recommended.
If you are returning your unit for warranty work or repair, please call
BayTech to get a Return Authorization number. Please put the Return
Authorization number on the outside of the cardboard box. BayTech
cannot accept no-charge returns without this number.