In the Endor Bunker level, fall down the moving platforms 3 times. Fall to the left and you'll land on a platform. Kill the droid and walk until you find a heart. It will restore your health completely.
Level Passwords
Dance Hall SNKMTD
Sail Barge RWVJBC
Endor TFGBMN
Ewok Village HJMKPL
Power Generator QGTHGD
Death Star PSVZKL
Tower SFPYSW
Death Star mission 1 CGGYQN
Death Star mission 2 KFGZXQ