Audi error codes

[Concho]

Hi

I've just had my Audi A4 2.0 Auto, 2001, hooked up to diagnostics after the engine light came on, and it threw up 2 codes:

17887 Brake Boost Vacuum System: Mechanical Failure

17536 P1128 Long Term Fuel Trim - System too Lean (Bank 1)

I've googled a bit and it seems to be saying check hoses for leaks etc.

I'm pretty poor at mechanical things so I'm going to find a garage tomorrow, but does anyone have any ideas of what it means if both codes are showing? What could I be looking at price wise?

Cheers