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mmm, ...are you sure that the pedal has never been feeded with inverse polarity?
i could easily be wrong (and i hope so), but probably one or more than one component is broken (ICs, transistors). this can easily happen if you use a wrong polarity adaptor (or an alternate current power supply instead of continous current)

anyway i would try and substitute r52 (with a normal through-hole 1/4W res it's ok, don't do it if you're not skilled with soldering), see if it still gets hot, and if not check voltages on the PCB


EDIT: i have seen now your edited message.
so if you can measure voltages without smoke, then get voltages on the OP-Amps (2 smaller ICs with 8 pins), expecially PIN8; here you should have around 9V

EDIT2: sorry, it's late in the night and i'm tired. yes, voltages on c28 and c29 are too low. on c28 you should measure 9V

Thank you for your reply!

Intripped wrote:mmm, ...are you sure that the pedal has never been feeded with inverse polarity?

No i dont. I've desoldering and checked all electrolitic caps - they are all working ok. TL072 is ok too.

Intripped wrote:anyway i would try and substitute r52 (with a normal through-hole 1/4W res it's ok, don't do it if you're not skilled with soldering), see if it still gets hot, and if not check voltages on the PCB

R52 is good.

Ground and +9V still in short circuit (35 Ohm resistance between them). And I cant understand why. Maybe I should check out the rest of the ICs...

For many reasons it's not easy to help you out with this issue: schematic is not 100% complete, the PCB has smd components (very difficult to work with), ...I'm not a real experienced tech.
Anyway, what I would do is to desolder the ICs, one by one, and check if the correct supply voltage comes back after each desoldering.
I would do the same with transistors.
and also diodes, if they are implemented for inverse polarity protection, but I can't say it looking at the schematic.

If you have a friend with electronic skills I think you had better ask him for some help