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Background:

Master of the Forge (Forces of the Space Marines p. 70)
Wargear:
• Servo-arm
• Servo-harness

Master of the Forge (Army List: HQ p. 133)
Wargear:
• Artificer armour
• Servo-harness
• Boltgun or bolt pistol
• Frag and krak grenades

** Note that servo arm does not appear; The Master of the Forge does not get a single servo arm. Just the harness.

(from p. 71)
Servo-arm: Techmarines and Servitors are equipped with powerful servo-arms that can be used for battlefield repairs or even put to use as a weapon. Each Servo-arm grants the model a single extra close combat attack, made seperately at Initiative 1 and Strength 8, ignoring Armour Saves.

Servo-harness: A servo-harness gives the Techmarine an extra servo-arm (giving him two servo-arm attacks), a plasma cutter (fired in the Shooting phase as a twin-linked plasma pistol, but cannot be used in close combat) and a flamer. In the shooting phase the Techmarine can fire both harness-mounted weapons, or one harness mount and another gun.


The Servo Harness appears to grant 2 servo arm attacks, despite its claim of "an extra servo-arm" since a MotF doesn't get the single arm to begin with, just the 'pair' afforded by the harness.


To back this up, the Techmarine Army List entry (p. 138)
Options:
• Upgrade servo-arm to a servo-harness +25 pts


Here the servo-arm is replaced by the servo-harness, trading 1 servo arm attack for 2, also gaining the plasma cutter and flamer. Note that it does not that the techmarine can 'add' a servo-harness in addition to his servo-arm, he must replace it.

What this means, (and my interpretation of all this).

Servo Harness provides two servo-arms. On the MotF, this means that he gets two servo arm attacks, plus the benefits of the harness. Also if he were to take a conversion beamer, he must exchange his servo harness for it, and thus loses both servo arms (and subsequently both attacks).

Is this correct?

Yes, you are correct. The Servo harness gives two Servo Arm attacks (regardless whether it came as standard or replaced a Servo Arm) + Other Gizmos and if you replace it for a Conversion Beamer, you loose the Extra Attacks and other Gizmos.

Yes, it really is that simple.

Servo-arm = 1 attack
servo-harness, which /= 2 servo arm but is in fact seperate and complete, = 2 attacks