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Cannot boot to Windows after partitioning and SMC/NVRAM Reset

I have a late 2014 Macbook Air that is running Windows 7 via bootcamp. Everything has been humming along fine until I recently made an update to partitions (via "Disk Utility" shrink size of Mac partition > Boot to Windows > Use partition software [MiniTool Partition Wizard] to merge the unallocated space with the bootcamp partition) and proceeded with a NVRAM and SMC resets via instructions available here (https://www.macworld.com/article/2881177/macs/how-to-reset-your-macs-nvram-pram- and-smc.html). I realized after performing the NVRAM and SMC resets that bootcamp no longer appeared in "Startup Disk" and I was only able to boot to Windows via Boot + hold down option key + select Windows HDD icon from the UI that appears.

I cannot confirm the issue was a result of the NVRAM/SMC resets or the previous partition updates as following the completion of my partition updates I had not booted back into Mac. The first time following the partition updates that I booted back into MAC was during my NVRAM/SMC resetting activities. My gut tells me the issue was the result of the partitioning actions.

In a foolish attempt to remedy the [Bootcamp not appearing in "Startup Disk"] situation I stupidly utilized "Disk Utility's" "repair disk" function on the greyed out partition named "disk0s4" - it was previously named BOOTCAMP. The repair function failed and reported as such. After this point I was no longer able to boot to windows via Boot > Hold Down Option Key > Select Windows because the UI now only displayed the recovery and the MAC HDD icons and text designating them so.

I've concluded after some googling that I've managed to corrupt my MBR/GPT records and am about to proceed with fixing it via instructions here: bootcamp - Boot Camp partition broken and can't be repaired in OS X 10.10.4 - Ask Different

I'm not sure this is the right course of action. Desperate for advise from any enlightened individual about how to resolve this situation and recover access to my Windows OS via bootcamp!

Some basic details of my Macbook Air 13-Inch