So, did you replace the DC-In-Board and fix your faulty machine or just buy a new/replacement A1138 (PwrBk 5,8)?
Replaced the DC-In. And the pcmcia bay which had the eject button broken, and the HDD with a bigger one, and the cmos battery. All parts from another working PB5,8 I found very cheap (46€ including shipping). Instead of transfering the MOS license, I opted for using it as spare parts, because it was externally very damaged compare to mine. And the screen has "spots" in it. So I still have some more spare parts :)
PowerBook 5.2 MorphOS 3.12
PowerBook 5.8 MorphOS 3.12
Amiga 1200 BPPC/BVision AOS4.1 FE