these are voltage regulators, aren’t they? I just checked on mouser for the 1st one and there are 15 alternatives… with almost all boxes checked - so they should be reasonably easy to substitute
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I can’t remember what I used - I built my castle modules a few years ago… all I can recommend is get the spec sheet for the originals and find something as close to identical as possible… and then ask if they are good substitutes…
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Have you got a breadboard & voltage metre device to test the voltage regulators you’ve previously sourced? It’s not hard to build a circuit to test the regulators & see if they’re outputing the expected 5V & -5V or the 78L05 & 79L05 regulators.
I remember one of my Castle builds required reflowing on a V regulator 3 times. The 3x pads were really close to eachother, parallel almost rectangles rather than a triangle made up of 3 circular pads. The case I tested would shut down intirely which freaked me out at first but didn’t damage anything in the end, as the circuit is designed, thanks to the reverse voltage protection diodes.
Feel free to post a photo or photos on here of the PCB/s. The obvious mistake is an IC that’s in the wrong way around, that’s almost 100% definitely going to fry an IC or ICs on a PCB unfortunately.
Hopefully you’ve found a solution since you posted @J-DVR 
Update:
Here’s a nice example of building a 5V circuit rathering than testing a 5V regulator but if it’s steadily outputting 5V, it should be fine:
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Thank you Robin for your response and the useful information!
Building a circuit to test would have been the plan…but this was one of the few times I had no extras left. I spoke to Phil briefly about it and he actually suggested the same exact thing.
Currently I decided to put a pin in it until the Fall probably. I live in the south USA and my workplace is not climate controlled…that and I’ve been too hyper focused on it so for my mental health as well I’ll be taking a break.
I will definitely come back to it and post if I need to. Hopefully score an oscilloscope in between and do some more studying / research before jumping all back in.
The hardest part for me (besides the modules not working after 15 mins or so) is soldering those pads…thank god for flux! …so it is interesting to hear you had to reflow 3 times. I’m still pretty confident without testing that I had some bad VRs but next time around I will be more mindful of possible reflowing and maybe just test the new VRs on a breadboard to be extra sure!
I’ll make sure to triple check those ICs also when I get back to it as well. Thank you again for the info!
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