...Makes sense on why he couldn't find it. On a cybertronian, ports were more common on the head and neck since it was a more direct route to the brain. Honestly, at this point he was uncertain if Miria's brain was in her head. Or may she didn't have one?

"Oh, thank you..."

This was awkward, he leans over her, takes her wrist, and then gently slides the plug home into the port. Without much further hesitation, he starts to run his system diagnostic program.