Neglected items

Are these items really so expensive to DIY or get a technician to replace?

2 x Blown Bulbs in 3rd Brake Lamp
1 x Blown Bulb in Tail Lamp
Leaving only 1 brake lamp - very sad face

2 x Blown Reverse Bulbs

aircon was said to be overhauled by some famous workshop, it is sweating and leaking