# LAYER 4 - SINGLE-FAULT CORRECTION LOCK
**Status**: ONE ERROR AT A TIME WITH RE-TESTING

## CORRECTION LOG

### Fix #1: Line 659 - Escaped Quotes
**FILE**: Helper\WinRepairCore.ps1
**LINE**: 659
**BEFORE**: `Evidence = @("pending.xml contains exclusive=\"true\"")`
**AFTER**: `Evidence = @("pending.xml contains exclusive=true")`
**RE-TEST RESULT**: ✅ PASS (0 parser errors)
**NEW ERRORS INTRODUCED**: 0

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### Fix #2: Line 936 - Variable Colon
**FILE**: Helper\WinRepairCore.ps1
**LINE**: 936
**BEFORE**: `$evidence += "BCD device points to $($deviceLine.Matches[0].Groups[1].Value): expected $driveLetter:"`
**AFTER**: `$evidence += "BCD device points to $($deviceLine.Matches[0].Groups[1].Value): expected ${driveLetter}:"`
**RE-TEST RESULT**: ✅ PASS (0 parser errors)
**NEW ERRORS INTRODUCED**: 0

---

### Fix #3: Line 940 - Variable Colon
**FILE**: Helper\WinRepairCore.ps1
**LINE**: 940
**BEFORE**: `$evidence += "BCD osdevice points to $($osdevLine.Matches[0].Groups[1].Value): expected $driveLetter:"`
**AFTER**: `$evidence += "BCD osdevice points to $($osdevLine.Matches[0].Groups[1].Value): expected ${driveLetter}:"`
**RE-TEST RESULT**: ✅ PASS (0 parser errors)
**NEW ERRORS INTRODUCED**: 0

---

## FINAL STATUS

**Total Fixes Applied**: 3
**All Fixes Re-Tested**: ✅ YES
**New Errors Introduced**: 0
**Current Parser Status**: ✅ ALL FILES VALID

**STATUS**: ✅ ALL FIXES VERIFIED - NO REGRESSIONS

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**LAYER 4 COMPLETE - READY FOR LAYER 5 (ADVERSARIAL TESTING)**
