2005 Mercury 115 EFI 4-Stroke Yamaha or Mitsubishi power head?

I recently purchased a boat with a Mercury 2005 115 EFI 4-stroke. I was told that it had a Yamaha powerhead and when I had the motor surveyed it checked out good with 220 hrs / compression 190 -195. I noticed on the computer read out that it says Mitsubishi after the serial number. I am also having a hard time finding a service manual for this year. The only ones I am finding is ending in year ’04. Can any give me any insight on this motor? Thanks in advance for any help you may be able to give me.

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2005 Mercury 115 EFI 4-Stroke Yamaha or Mitsubishi power head?

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