diff --git a/relay/playbooks/ember-tune-pc1.ps1 b/relay/playbooks/ember-tune-pc1.ps1
index 741619f3..d498f652 100644
--- a/relay/playbooks/ember-tune-pc1.ps1
+++ b/relay/playbooks/ember-tune-pc1.ps1
@@ -145,6 +145,12 @@ $rows = 0
 $firstStatusAt = $null
 $lastMining = $null
 $lastEngineLine = ''
+function EngineLogDump([string] $why) {
+  Write-Output ('===== engine log tail (' + $why + ')')
+  $t = Get-ChildItem -Path $sLogs -Filter 'app-*.log' -ErrorAction SilentlyContinue | Sort-Object LastWriteTime -Descending | Select-Object -First 1
+  if ($t) { Get-Content -LiteralPath $t.FullName -ErrorAction SilentlyContinue | Where-Object { $_ -notmatch 'status: accepted 0 blocks' } | Select-Object -Last 80 | ForEach-Object { Write-Output ('  ' + $_) } } else { Write-Output '  (no app-*.log in the scratch logs folder)' }
+  if (Test-Path -LiteralPath $errFile) { Write-Output '===== engine stderr'; Get-Content -LiteralPath $errFile -ErrorAction SilentlyContinue | Select-Object -Last 20 | ForEach-Object { Write-Output ('  ' + $_) } }
+}
 function EngineTail() { $t = Get-ChildItem -Path $sLogs -Filter 'app-*.log' -ErrorAction SilentlyContinue | Sort-Object LastWriteTime -Descending | Select-Object -First 1; if ($t) { $l = Get-Content -LiteralPath $t.FullName -Tail 1 -ErrorAction SilentlyContinue; if ($l) { return [string]$l } }; return '' }
 while (-not $p.HasExited) {
   Start-Sleep -Seconds 5
@@ -156,12 +162,14 @@ while (-not $p.HasExited) {
   }
   if ($firstStatusAt -and -not $lastMining -and ((Get-Date) - $firstStatusAt).TotalSeconds -gt 120) {
     Write-Output ('RESULT TUNE error=not_mining reason=no_card_mined_within_120_s_of_the_first_status_line last_log_line=' + ($lastEngineLine -replace '\s+', '_'))
+    EngineLogDump 'watchdog: not mining'
     EndTree $p.Id 'watchdog: not mining'
     Write-Output 'RESULT TUNE error=no_rows'
     exit 3
   }
   if ($lastMining -and ((Get-Date) - $lastMining).TotalSeconds -gt 300) {
     Write-Output ('RESULT TUNE error=stopped_mining reason=every_card_idle_for_300_s last_log_line=' + ($lastEngineLine -replace '\s+', '_'))
+    EngineLogDump 'watchdog: stopped mining'
     EndTree $p.Id 'watchdog: stopped mining'
     Write-Output 'RESULT TUNE error=no_rows'
     exit 3