ATS 909X needs repair

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Before showing anything, I would like to say that this radio is great and what I'm showing here was most likely caused by an accident. My intention is simply to repair this receiver to continue enjoying this wonderful device to its fullest. It is a Sangean ATS 909X, 2014, China, software information 1.29R (firmware/software version).

Currently, this radio works fine in most of its main functionalities.
However, some important functionalities described on the user manual stop working and I have no idea what caused this problem.

For example:
1. The button SSB does not work. I mean, I cannot listen to SSB (LSB/USB) stations;
2. The green button (On/Off) does not work in some situations (to turn off the radio, I have to press the button Time set (1 - see user manual), Daylight Save Time Switch (2 – see user manual) or “(13) STEP”;
3. The “(1) Time set”, “(2) Daylight Save Time Switch” and “(3) Home / World Time Selection” do not work as shown on the user manual;
4. The set of buttons “(14) Tuning Up and Tuning Down”, just Tuning Down works;
5. If I press the button “(13) STEP”, the radio turns off (to switch the tuning speed I have to press the button “(3) Home / World Time Selection”;
6. The action “reset Time and Microprocessor” by using the “RESET SWITCH” does not change the behavior reported above;
7. Lock switch (15) does not work;
8. Time alarm 1, 2 and 3 (28) do not work properly;
9. Squelch button (11) does not work properly.
In general, I can listen to FM, LW, MW, and regular SW stations. Despite this situation, I think it is a really nice radio. For this reason, I would like some support or instructions that help me to fix these issues.