I've done a lot of reading and research on Malibu
No replacement parts for Power pack, or schematic >>
Malibulights.com shows replacement lights and replacement power packs
Manual for Malibu 600 Watt power packSAVE the pins off old power pack and see if they match pins on new power pack ... because you can't find pins on the internet
When the power pack goes bad or you lose the pins, then you buy another power pack
Things to remember:
Match number of lights to power pack wattage
30 - 20 Watt bulbs => 30 x 20 = 600 Watt power pack
Replace bulbs as soon as they burn out, or other bulbs will burn out quickly, and I think it causes power pack to burn out sooner too.
Up-vote if this helped. Thanks for the feedback.