Daikin Comp and inverter

[WCC73]

I have a Daikin underslung outdoor unit (single phase 10kw) which has failed under warranty after 3 months.
Fault code L5 and after many telephone conversations with Daikin they/ i have decided that it is a faulty comp and inverter board.
Does anybody have any tips with regarding the replacement.?It looks a bit of a sod of a job from what ii saw today.
I take it there is no point in me asking if Daikin will swap the outdoor unit complete which would make my life much easier?
Also do Daikin still offer a labour allowance for carrying out these jobs?

[install monkey]

i had a 14kw cassette alarm on l5 after 5mth.used an inverter checker -45 quid and proved 3 outputs . replaced just the compressor and no probs that was 18 mth ago.