A number of changes to North Channel navigation lights are listed in the most recent Canadian notice to mariners:

Notices to Mariners/Avis aux navigateurs:
20100101 - 20100131

Affected charts: L/C2201 2205 2235 2245 2250 2251 2274 2292

Cartes modifiées : L/C2201 2205 2235 2245 2250 2251 2274 2292

While at the web site, you can sign up for electronic (e-mail) updates to Notice to Mariners (see "Subscribe to email notification service" in the left side panel)...