All the while I had been thinking the battery was the culprit every time the starter motor didn't do its job. But the battery works fine when used on another car.
So I decided to DIY.
Tools Required

1.Turpentine, old towel, brush, and plastic cup for cleaning purposes
2. Flashlight
3. 13mm, 8mm and 7mm box wrench c/w ratchet handle and 6" extension bar
4. 13mm & 10mm combination spanner
5. Flat screw driver
206 Engine Bay
206 Engine Bay is very cramped. Without removing battery, air intake hose, etc the starter motor is hardly visible.
Air Intake Hose and Battery Removal
1. By using a flat screw driver I loosened clip rings on both sides of the air-intake hose to remove it.
2. Un-clamped battery +ve terminal by lifting up locking lever [in red]. Used 10mm spanner to loosen nut on the -ve terminal clamp. Undo clamp-down bracket at the battery base by using 13mm box wrench with the 6" extension bar and the handle. Lifted up the battery to remove it.
Then the top part of the starter motor was visible with "
Valeo" mark.
Starter Motor Removal
There are three bolts which hold the starter motor to the engine block. One of the bolts is 'hidden' behind aircond refregerant pipings/clips.

Removed this clip by using 13mm box wrench...

...then the 'hidden' bolt head could be seen to be loosened.
Before loosening and removing the other two bolts that hold the starter motor, the two electrical connections at the solenoid terminals were disconnected by using 13mm and 8mm combination wrench respectively.

Removed the faulty starter motor...
starter motor and the solenoid
...then overhauled it. The only tool required were 7mm spanner and a torx wrench [allen key also can].
starter motor components
Armature and planetary gears
After inspecting the armature, commutator and carbon brushes I found nothing wrong
[electrically] with them.
Reassembled and reinstalled the starter motor back. The motor turned and cranked the engine on first trial but when restarted the engine the starter didn't work again. I suspected the problem was as a result of the corroded electrical contacts in the sealed solenoid assembly that impeded the full flow of electrical current to the motor windings when it was hot.
Unfortunately the solenoid is unserviceable and worse still it is not sold separately [without the motor].
Aftermarket price is around RM600~RM750 depends on which
brand - capayam is much cheaper
. According to an authorised Peugeot SC Genuine starter motor is sold around RM1300 excluding installation charge!
I bought an aftermarket starter motor for RM620 and replaced the faulty unit.

Eventhough this procedure is for Peugeot 206, the same principle can also be applied to Peugeot 308. I burned RM600++ for the starter motor which failed just barely one month after the warranty period had expired but I
saved more than RM700 compared with the quotation by a Peugeot Authorised SC! I simply love DIY...
Related DIY
How to Remove or Replace 206 Brake Pads
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