JRC JCY-1900 Service Manual page 70

3. OPERATION CHECKING ON HARDWARE
JCY-1900/1950 VDR Service Manual
3.2.3. Check the expiration dates
Check the following. If the expiry date is approaching, replace new one.
・ EPIRB Battery
・ Hydrostatic Release Unit (HRU)
DOC No. 7ZPNA4409
Expiration date of HRU
(Hydrostatic Release Unit）
Expiration date of Battery
52