EP-MA73, EP-MA73KU892 (serv.man2) - Panasonic Other Service Manuals Service Manual (repair manual). Page 59

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Move the Massage mechanism block to the highest position.

* After installing the Connecting cord for power source, be sure to move the Massage mechanism block up an down pushing the 

and   buttons on the Controller by Secret mode (CE) so as to check whether each Connecting cords do not touch Belts or the
Rear cover fixing plate or are not hooked on the Up/down pinions on both right/left sides.  And check also if each Connecting cords
are not extremely tense when the Massage mechanism block is at the highest position.

When installing the Rear cover, move the Massage mechanism block to the highest position first so as to prevent the hooking of
each Connecting cords.  And wind the cord around the wire.  If you wind the wire around the cord, the wire becomes bent.